I would highly, highly suggest the IGGEE seat covers. $300 for the full set, but they are probably the best fitting (and best looking) seat covers on the market for the TJ.
Personally I really love my TrekArmor (now Bartact because Trek Mountain bikes got together with Under Armor and sued them - no joke) seat covers. They fit great and after two years of mostly topless summers they haven't faded at all. I'll snap some photos later on today if you're interested in seeing them outside of marketing pictures.