The skids are basically the same on all XJs. Up-Country was a package that included the factory skids, but they'll fit all models, allowing for the following considerations:
Front: pretty much anything 84-01 should fit, but I'm not 100% sure on the 97+ on pre-96 models.
Transfer Case: you can pull this one from anything from 84-01.
Gas Tank: 97+ skids won't fit pre-96, due to differences in the tank (steel vs. plastic). I think anything pre-96 should work, but definitely anything off a 4.0L XJ should be right on the money.
From a boneyard, I wouldn't expect to pay more than $15-20 each.
Incidentally, if you happen to see an XJ with a decent-looking receiver hitch also, snatch that up as well - should be similar price.
You can try to get the mounting hardware as well off the donor wreck, but dont' expect it to be in very good shape - the nut rails I got turned out to have pretty badly bunged up threads, and I wound up not using them. Fortunately, hardware is cheap, and enough of us here have the instruction sheets from skids (I've got sheets from the front and t/c skids myself) we got from dealers that we can tell you what Chrysler/AMC spec'd for mounting bolts/nuts.
I got a hitch and gas tank skid for $25, and the guy I went to even pulled them off the wreck for me. I'd have gotten the T/C one from him as well, but some kids carried that one off in the night (go figure). A little sanding and Rustoleum, and the skid and hitch looked almost factory-new.
Rob
P.S. If you don't have a FSM, consider getting one - the illustrations were invaluable to me in mounting the OEM skids on my '92, particularly since the instructions (on the ones I had bought new) didn't come with pictures.
