6.5" all the way around. With some modification of aftermarket brackets, you can fit a 6.75" if they're not too deep. Depth is going to be your enemy. If Crutchfield says they're not going to fit, they probably won't fit because of depth. Take their word for it.
The stock are technically 6.75, 6.5's fit. Good ones come with an adapter ring and bolt right up.
1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ Platinum Limited 5.9, Backyard parts fodder
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style
Originally Posted by Texas ZJ1
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
The problem with most aftermarket 6.75s is they're too deep and the Chrysler adapters generally work with 6.5" speakers, not 6.75" speakers. Chrysler speakers, even the Infinity ones, use a 3 screw mounting pattern. Aftermarket speakers mostly use a 4 screw mounting pattern. No aftermarket speaker bolts up directly without an adapter.