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Thats right, I had to use the adapter plates for the 6.5" infinitys I just put in not long ago. From the looks of it a 6.75 would drop right in the door.
i thought it was 5.75 front but i know for shure its 4x6 in the back. i think you can fit 4" in the back w/ an adapter. thats if you want round speakers.