I don't think you can make the rear XJ retainers work, some only have two studs, all MJ ones have three. Inevitably you will break a couple of studs, I have on all three of my MJs. What I've done is grind off the stud heads and punch out the studs. Then braze in new bolts (Stainless is preferred with the right brazing rod). It's pretty easy, just time consuming because I decided to replace all 36 studs every time. You can also try http://www.chryslerpartsdirect.com/ go to the collision catalog then Fender, Exterior trim, Wheel flare, Retainer they're ~$15 each, then you'll need the nuts also (I assume). Not sure if they really have them, they list parts that aren't available sometimes. Good luck.