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Car Stereo Installation & Accessories for your 2018 Optima

Installing an aftermarket head unit involves more than just choosing a screen; it's about building a bridge between new technology and your vehicle's factory architecture. Without the right installation accessories, a high-end receiver can't provide the seamless look or the integrated functionality your car was designed with. From dash kits that match your interior texture to complex digital interfaces that talk to your vehicle's computer, these components are what make a professional-grade installation possible.

Whether you're looking to retain your steering wheel controls, adapt a proprietary antenna plug, or ensure your new Double-DIN screen sits flush in the dash, we carry a comprehensive selection of gear from industry leaders like Metra, Scosche, PAC, and iDatalink.

Use our FitFinder to find the exact parts required for your specific year, make, and model. It's the most reliable way to ensure your DIY project results in a factory-finished look.

It's a no-brainer. Get your installation gear here.

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iDataLink Maestro HRN-ANT-SAT2 Antenna Adapter

Connect Factory Satellite Stereo Antenna Adapter with SiriusXM Tuner

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Connect Factory Satellite Stereo Antenna Adapter with SiriusXM Tuner

• 39" Satellite stereo antenna adapter
• Connect factory satellite antenna to aftermarket stereo
• SMB connector for use on most aftermarket stereo tuners
• Compatible with all OEM satellite stereo antenna using FAKRA connector

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1
List price $21.99
-23% $16.99

In stock

• 39" Satellite stereo antenna adapter
• Connect factory satellite antenna to aftermarket stereo
• SMB connector for use on most aftermarket stereo tuners
• Compatible with all OEM satellite stereo antenna using FAKRA connector

Axxess AXBUCH6V-HK1

Install a New Car Stereo and Add or Retain Backup Camera in select 2014-2025 vehicles from Hyundai, Kia with Navigation

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Install a New Car Stereo and Add or Retain Backup Camera in select 2014-2025 vehicles from Hyundai, Kia with Navigation

• Camera retention and add-on harness
• Compatible with select 2014-2025 vehicles from Hyundai, Kia with navigation
• Retains the factory backup camera to an aftermarket radio
• Includes the Axxess AXCSD-6V 12-volt to 6-volt converter

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List price $51.99
-12% $45.99

In stock

• Camera retention and add-on harness
• Compatible with select 2014-2025 vehicles from Hyundai, Kia with navigation
• Retains the factory backup camera to an aftermarket radio
• Includes the Axxess AXCSD-6V 12-volt to 6-volt converter

Scosche KAAB Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 2007-2025 vehicles from Hyundai, Kia, Genesis

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Connect your factory antenna to a new aftermarket radio for select 2007-2025 vehicles from Hyundai, Kia, Genesis

• Scosche Antenna Adapter
• Aftermarket Antenna Male (Motorola Plug) to Factory Radio Female (Proprietary Plug)
• select 2007-2025 vehicles from Hyundai, Kia, Genesis Vehicles

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List price $7.85
-11% $6.99

In stock

• Scosche Antenna Adapter
• Aftermarket Antenna Male (Motorola Plug) to Factory Radio Female (Proprietary Plug)
• select 2007-2025 vehicles from Hyundai, Kia, Genesis Vehicles

iDataLink Maestro ACC-NAV1

Connect Factory GPS Antenna to Select Alpine and Kenwood Navigation Stereos

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Connect Factory GPS Antenna to Select Alpine and Kenwood Navigation Stereos

• Fakra on factory GPS to select Alpine and Kenwood stereo
• Includes 9" GPS antenna adapter cable
• Plug-n-play, easy installation

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1
List price $21.99
-23% $16.99

In stock

• Fakra on factory GPS to select Alpine and Kenwood stereo
• Includes 9" GPS antenna adapter cable
• Plug-n-play, easy installation

iDataLink Maestro ACC-NAV2

Connect Factory GPS Antenna to Select Pioneer Navigation Stereos

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Connect Factory GPS Antenna to Select Pioneer Navigation Stereos

• Fakra on factory GPS to select Pioneer stereos
• Includes 9" GPS antenna adapter cable
• Plug-n-play, easy installation

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List price $21.99
-23% $16.99

In stock

• Fakra on factory GPS to select Pioneer stereos
• Includes 9" GPS antenna adapter cable
• Plug-n-play, easy installation

iDataLink Maestro HRN-ANT-SAT1 Antenna Adapter

Connect Factory Satellite Stereo Antenna Adapter with SiriusXM Tuner

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Connect Factory Satellite Stereo Antenna Adapter with SiriusXM Tuner

• Satellite stereo antenna adapter
• Connects SiriusXM to vehicle's factory satellite stereo antenna
• FAKRA-to-SMB adapter cable
• Plug-n-play installation

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List price $21.99
-23% $16.99

Available

Ships in 10-14 days

• Satellite stereo antenna adapter
• Connects SiriusXM to vehicle's factory satellite stereo antenna
• FAKRA-to-SMB adapter cable
• Plug-n-play installation

iDataLink Maestro ACC-USB-HK2 USB Adapter

Connect Factory USB Port to Aftermarket Car Stereo in select 2015-2025 vehicles from Hyundai, Kia

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Connect Factory USB Port to Aftermarket Car Stereo in select 2015-2025 vehicles from Hyundai, Kia

• USB adapter for select 2015-2025 vehicles from Hyundai, Kia
• Retains vehicle's factory USB port
• Connects factory USB port on aftermarket stereos

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List price $75.99
-21% $59.99

In stock

Only 1 Left!

• USB adapter for select 2015-2025 vehicles from Hyundai, Kia
• Retains vehicle's factory USB port
• Connects factory USB port on aftermarket stereos

iDataLink ADS-MIC1

Factory Microphone Retention Interface Module for select 2010-2024 vehicles from Ford, Subaru, Toyota (Requires ADS-MSR, MRR, or MR2 Module)

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Factory Microphone Retention Interface Module for select 2010-2024 vehicles from Ford, Subaru, Toyota (Requires ADS-MSR, MRR, or MR2 Module)

• Factory microphone retention interface module
• Retains the factory microphone when adding an aftermarket stereo
• Compatible with select 2010-2024 vehicles from Ford, Subaru, Toyota

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List price $99.99
-20% $79.99

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• Factory microphone retention interface module
• Retains the factory microphone when adding an aftermarket stereo
• Compatible with select 2010-2024 vehicles from Ford, Subaru, Toyota

Metra 70-7304 Wiring Harness

Install a New Car Stereo in select 2010-2021 vehicles from Kia, Hyundai

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Install a New Car Stereo in select 2010-2021 vehicles from Kia, Hyundai

• Direct Connection to the car factory harness
• Color coded wires for easy installation
• Powers up to 4 speakers

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List price $32.99
-42% $18.99

In stock

Only 1 Left!

• Direct Connection to the car factory harness
• Color coded wires for easy installation
• Powers up to 4 speakers

Metra AXUSB-HK2

12" USB Retention Adapter for select 2008-2021 vehicles from Hyundai, Kia

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12" USB Retention Adapter for select 2008-2021 vehicles from Hyundai, Kia

• USB Retention Adapter
• Designed to retain the factory USB when replacing the stereo
• Aftermarket stereo must have a rear USB input
• Compatible with select 2008-2021 vehicles from Hyundai, Kia

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• USB Retention Adapter
• Designed to retain the factory USB when replacing the stereo
• Aftermarket stereo must have a rear USB input
• Compatible with select 2008-2021 vehicles from Hyundai, Kia

Metra 40-KI10 Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 2007-2025 vehicles from Hyundai, Kia, Genesis

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Connect your factory antenna to a new aftermarket radio for select 2007-2025 vehicles from Hyundai, Kia, Genesis

• Compatible with select 2007-2025 vehicles from Hyundai, Kia, Genesis Vehicles
• Connects the factory antenna to an aftermarket radio

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1
List price $16.99
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In stock

• Compatible with select 2007-2025 vehicles from Hyundai, Kia, Genesis Vehicles
• Connects the factory antenna to an aftermarket radio

Axxess AXBUCH6V-HK2

Install a New Car Stereo and Retain Backup Camera in select 2013-2018 vehicles from Hyundai, Kia

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Install a New Car Stereo and Retain Backup Camera in select 2013-2018 vehicles from Hyundai, Kia

• Camera retention harness
• Compatible with select 2013-2018 vehicles from Hyundai, Kia
• Retains the factory backup camera to an aftermarket radio

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List price $52.99
-11% $46.99

In stock

• Camera retention harness
• Compatible with select 2013-2018 vehicles from Hyundai, Kia
• Retains the factory backup camera to an aftermarket radio

Crux SWRHK-65Q

Install a New Car Stereo and Retain Steering Wheel Controls and Other Factory Features in select 2016-2022 vehicles from Kia, Hyundai with Factory 5" Screens

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Install a New Car Stereo and Retain Steering Wheel Controls and Other Factory Features in select 2016-2022 vehicles from Kia, Hyundai with Factory 5" Screens

• Direct connection to the factory harness
• Color coded wires for easy installation
• No cutting or splicing required

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List price $168.00
-36% $108.00

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• Direct connection to the factory harness
• Color coded wires for easy installation
• No cutting or splicing required

iDataLink Maestro HRN-HRR-HK2

Install a New Car Stereo in

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Install a New Car Stereo in

• Wiring harness to install new iDatalink-compatible receiver
• Compatible with
• Retains SWC, rear seat entertainment system and more
• Provides certain navigational outputs and engine/vehicle data

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List price $199.99
-30% $139.99

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• Wiring harness to install new iDatalink-compatible receiver
• Compatible with
• Retains SWC, rear seat entertainment system and more
• Provides certain navigational outputs and engine/vehicle data

Axxess AXBUCH-HK1

Install or Retain Backup Camera in select 2014-2025 vehicles from Hyundai, Kia with Navigation

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Install or Retain Backup Camera in select 2014-2025 vehicles from Hyundai, Kia with Navigation

• Camera retention and add-on harness
• Compatible with select 2014-2025 vehicles from Hyundai, Kia with Navigation
• Retains the factory backup camera to an aftermarket radio
• Allows an aftermarket camera to be added to the OEM screen

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List price $39.99
-10% $35.99

In stock

Only 3 Left!

• Camera retention and add-on harness
• Compatible with select 2014-2025 vehicles from Hyundai, Kia with Navigation
• Retains the factory backup camera to an aftermarket radio
• Allows an aftermarket camera to be added to the OEM screen

Metra 71-7306 Wiring Harness

Factory Stereo Replacement Wiring Harness for select 2017-2023 vehicles from Kia, Hyundai

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Factory Stereo Replacement Wiring Harness for select 2017-2023 vehicles from Kia, Hyundai

• Wiring harness for select 2017-2023 vehicles from Kia, Hyundai
• Direct connection to the factory stereo
• Color coded wires for easy installation
• No cutting or splicing required

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List price $47.99
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In stock

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• Wiring harness for select 2017-2023 vehicles from Kia, Hyundai
• Direct connection to the factory stereo
• Color coded wires for easy installation
• No cutting or splicing required

PAC HWH1140

Install a New Car Stereo in select 2010-2018 vehicles from Hyundai, Kia

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Install a New Car Stereo in select 2010-2018 vehicles from Hyundai, Kia

• Wiring harness to install a new stereo
• Compatible with select 2010-2018 vehicles from Hyundai, Kia
• Plugs into the factory harness

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List price $24.00
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• Wiring harness to install a new stereo
• Compatible with select 2010-2018 vehicles from Hyundai, Kia
• Plugs into the factory harness

PAC KIAK1266

Single DIN or Double DIN Stereo Dash Kit for select 2016-2020 Optima

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Single DIN or Double DIN Stereo Dash Kit for select 2016-2020 Optima

• Single & Double DIN Install Dash Kit and Harness
• Compatible with select 2016-2020 Optima Vehicles
• For vehicles NOT equipped with 7" screen
• Accommodates ISO Single & Double DIN Mount
• Painted to Match Factory Dash Color
• High-Grade ABS Plastic Construction

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List price $74.00
-19% $59.99

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• Single & Double DIN Install Dash Kit and Harness
• Compatible with select 2016-2020 Optima Vehicles
• For vehicles NOT equipped with 7" screen
• Accommodates ISO Single & Double DIN Mount
• Painted to Match Factory Dash Color
• High-Grade ABS Plastic Construction

Metra 99-7377B

Single DIN Stereo Dash Kit for select 2016-2020 Optima

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Single DIN Stereo Dash Kit for select 2016-2020 Optima

• Single DIN Install Dash Kit
• Compatible with select 2016-2020 Optima
• Accommodates ISO Single DIN mount
• Painted to match factory dash color
• High-Grade ABS plastic construction
• Factory style texture

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List price $54.99
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• Single DIN Install Dash Kit
• Compatible with select 2016-2020 Optima
• Accommodates ISO Single DIN mount
• Painted to match factory dash color
• High-Grade ABS plastic construction
• Factory style texture

Axxess AXSP-HK Wiring Interface

Install a New Car Stereo and Retain Factory Amplifier in select 2012-2025 vehicles from Hyundai, Kia

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Install a New Car Stereo and Retain Factory Amplifier in select 2012-2025 vehicles from Hyundai, Kia

• Amplifier retention interface for select 2012-2025 vehicles from Hyundai, Kia
• Designed for amplified systems only
• Must be used with AXDIS-HK1 or AXDIS-HK2 (sold separately)

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List price $128.99
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• Amplifier retention interface for select 2012-2025 vehicles from Hyundai, Kia
• Designed for amplified systems only
• Must be used with AXDIS-HK1 or AXDIS-HK2 (sold separately)

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    FAQ Frequently asked questions in Car Stereo Installation & Accessories


    In most modern vehicles, the factory radio is part of a larger, integrated dash panel rather than a standardized rectangular box. A vehicle-specific dash kit provides the necessary brackets and trim pieces to adapt the universal ISO-mount of an aftermarket stereo to the unique shape and mounting points of your dashboard.

    Choosing the right Car Stereo Installation & Accessories begins with understanding your vehicle's make, model, and year. This information helps you select compatible wiring harnesses and mounting kits. Next, consider your audio preferences. If you're looking to upgrade your car's sound system significantly, opt for an amplifier installation kit that matches your amplifier's power requirements.Additionally, check the head unit's compatibility with your smartphone and other devices.

    Features like Bluetooth connectivity, Apple CarPlay, or Android Auto can greatly enhance your driving experience. Ensure that the accessories you choose align with your car audio goals, whether it's improved sound quality, convenience, or connectivity.

    Not if you use a Steering Wheel Control (SWC) interface. These modules translate the signals from your factory buttons into a language your new stereo understands. Many modern integration harnesses, like the iDatalink Maestro, include this functionality along with the ability to display engine data and tire pressure on your new screen.
    We strongly recommend using a wiring harness. Cutting factory wires is permanent, increases the risk of short circuits, and can void your vehicle's electrical warranty. A harness allows you to do all your soldering or crimping on the bench, then simply plug the new assembly into the factory connector without damaging the car's original wiring.

    Safety is paramount during Car Stereo Installation & Accessories installation. Start by disconnecting the car's battery to avoid electrical accidents. When handling wiring and electrical connections, follow proper insulation techniques to prevent short circuits or fires. Secure all cables and wires away from moving parts like steering columns and pedals.

    During the installation of amplifiers and subwoofers, ensure that they are securely mounted to prevent movement while driving. Avoid drilling into gas tanks, brake lines, or other sensitive areas when installing components. It's also a good practice to have a fire extinguisher and a first aid kit on hand in case of emergencies.

    All About

    Car Stereo Installation & Accessories

    Navigating the hardware required for a radio swap can be confusing. To get the job done right the first time, it's helpful to understand the specific role each accessory plays in the signal chain and the physical assembly.

    Dash Kits: The Cosmetic Foundation

    The dash kit is what ensures your new stereo doesn't look like an afterthought. These kits are engineered to match the exact color, texture, and contour of your factory dash.

    • Single-DIN Kits: Feature a 2-inch tall opening, often including a storage pocket to fill the extra space.
    • Double-DIN Kits: Feature a 4-inch tall opening designed for large touchscreens and multimedia receivers.
    • Multi-Kits: Versatile designs that can be configured for either size depending on your hardware choice.

    Wiring Harnesses and Data Interfaces

    The wiring harness is the electrical nervous system of your install.

    • Standard Harnesses: Provide basic power, ground, and speaker connections for older vehicles.
    • Data Interfaces: Required for modern vehicles with CAN-bus systems. These modules "talk" to the car’s computer to provide a 12V switched power source (which many new cars lack at the radio) and retain safety features like door chimes, OnStar, or factory amplifiers.

    Steering Wheel and Camera Retention

    Convenience and safety shouldn't be sacrificed for better sound. Dedicated interfaces allow you to keep your hands on the wheel and your eyes on the screen when reversing. If your vehicle has a factory backup camera, a camera retention adapter allows you to feed that video signal directly into your new touchscreen's RCA input.

    Professional Installation Tools

    Using the wrong tools can lead to cracked plastic or scratched leather. A set of nylon trim removal tools is essential for prying off dash panels without leaving permanent pry marks. Additionally, we recommend high-quality crimp connectors or heat-shrink tubing to ensure your electrical connections remain stable through years of vehicle vibration.

    The Sonic Electronix Advantage

    We take the guesswork out of the DIY process. When you use our vehicle selector, we don't just show you parts that "might" work; we curate a list of accessories verified to fit your specific cabin. As an Authorized Online Retailer for reputable brands, every interface and kit we sell is backed by full technical support to help you through the trickiest parts of your installation.

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    We love people and we're ready to help you! See what separates us from our competition.

    Take advantage of our VIP rewards like 10% back on your purchases, free 2-day shipping, extended warranties, and free returns! Gain access to all of these rewards without any membership fees.
    Get great discounted (and possibly FREE) installation accessories with most car stereo purchases. This includes dash kits, wiring harnesses and antenna adapters that you will need to properly install your new car stereo.
    We are an Authorized Dealer for all the brands we sell, including the most premium brands in car and marine audio such as Hertz, JL Audio, NVX, Rockford Fosgate, Kicker, Alpine, Kenwood and many more.
    Shop Deals and get up to 30% off premium brands! Shop Now! We are always looking out for the best products and deals to offer our customers. Don’t pay too much by shopping elsewhere!
    We have information on brands, gear, and more for you to explore! Check out our YouTube Channel for helpful how-to videos, product reviews, and Q&As. For a more detailed look, also visit our Learning Center!
    Our trained experts are here to assist you! They are just a phone call or click away to help you get the right gear for you and your vehicle!
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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

    • You see only parts engineered for your exact vehicle
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.