These are the speaker sizes that the product is compatible with. For car speaker adapters, these are the sizes of aftermarket speakers that will fit inside the adapter.
This is the size of the factory opening that the speaker adapter is designed to fit in. This is not the size of speaker that will fit inside of the adapter, but the size of the factory opening that the speaker adapter fits into.
This is the thickness of the spacer. Spacers are meant to extend the mounting depth. If no thickness is listed here, then the spacer/adapter is not meant to extend the mounting depth.
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