I went out to checked and have 6 1/2" speakers installed. I remember I did make my own adapters, maybe they recommend 5 1/2" if you get them with store bought adapters. The holes in the sound bar and the ones near the door can easily fit 6 1/2" speakers though. I got components up front and used the stock location for the tweaters, just had to grind the plastic out a tad and they snapped right in.
07 JK 2D X model with 6 speeds. Full Traction 3" ultimate lift kit. 315x75x16 Toyo Open Country M/T on Rock crawler procomp rim. Ruby dana44's front sleeved inside/outside C truss and rear with 5.13's gears. Homemade rock guards, rear bumper w/tire carrier, oilpan/tranny skid, evap canister skid, light bar, switch pod. Riddler diff covers, Cobra 75 w/wilson antenna, Polk speakers, 10" sub, 2x Amps, Lightforce 240 drive light, backup lights, rock lights.