They will FIT a YJ, as in the bolt pattern is the same. Backspacing is probably ok for 29" tires, mayyyybe 30's. You want 4" to 3.25" depending how far you want them to stick out, what size tire etc.
I think you will find more jeepers with 31-35's run that range.
The lower the backspace #, the more the wheel sticks out the sides. I run 3.25" on 33x1250s. I'd prefer the 3.5 but the price was too killer.
93' YJ 2.5L, 4.88's, 8.8, E-Locker & LSD