I want to upgrade my speakers in my truck but confused on the size of speakers i can fit. I checked a few web sites. Both say 6x9 for the front doors. But the rear door, one says 5 1/4 or 6 1/2. Just seeing who has installed aftermarket speakers and what size fits.

 

Check Crutchfield. They will show you all possible sizes that will fit. If you buy the speakers from them, they send you all of the adapters you need.