With the Scosche adapter rings, you'll be able to fit 5.25s. I used my adapter rings and cut them to make them bigger to fit my 6.75s. I'm not 100% on the rear doors but I believe they're the same. I don't believe in wasting money on rear speakers. I don't sit in back and I don't want to throw off my staging by adding rear speakers.
01 TJ - 4.0L, NV3550, 2" Skyjacker budget boost, Xenon flat flares, LoD front bumper, Tuff Stuff rear bumper, RH4X4 sliders, 33" STT Pros on 15x8s