I also replaced my severely shredded motor mounts w/ poly replacements. One suggestion for those trying to install them in the future. I also had to lift/lower a dozen times to get them to line up right. I found though that loosening the mounts on the engine a bit aids GREATLY in alignment. You don't have to remove the bolts, just loosen up and then put your cross bolt in (still kind of tricky) finger tight everything up and then tighten the mount to frame bolts, mount to engine bolts, and then cross bolt down to spec.
On a side note though, I also swapped out my tranny mount with a poly one and I get sickening vibration at idle now. It still feels really solid when driving but you feel every bit of drivetrain noise. Just something to think about if you like a nice & quiet Jeep (who does?)
