What happened to the 30s? Those tires you got are 29.5 x 8.5.
I don't want to turn this into a bash 4WP thread, because lord knows there is enough of them around, but when I got my first XJ, they pulled the same crap with me but I was trying to get 31s. To try and prove it they rolled the 31" tire outside and put it next to one of my tires and said, see it doesn't fit.................waiting for this to sink in..................WTF!!!! You can't do that! Hopefully you guys realize why but I had to sit there and explain to the salesman how that works. Heck with NO trimming on my 95, I ran the 31x10.50s for a couple days before I put my lift on and 4WP tried to tell me it wasn't POSSIBLE. My friend had the same issue when trying to get 33x12.50s for his 6" lifted XJ and they told him, according to their stupid little "guide", 10.50 is the absolute MAX width you can go on an XJ.