For some time I had been envious of the larger looking flares on YJs. The CJ rear fender flares look good with stock size tires, but look alittle goofy with oversized tires. I decided to try on some YJ rear fender flares to see if they fit, and it turns out that they do.
YJ rear fender flares will bolt directly onto a CJ. While this "upgrade" won't give you any more clearance (the body of the jeep isn't trimmed at all), in my opinion it looks better.
Just screw the new flare on. Although the fenders aren't trimmed at all it looks like the wheel has a lot more space, and seems to have a more up to date appearance.