The best one would be from Chrysler. Unfortunately, it's kinda pricey ($300+).
The first one I got for my 2000 (an Omix-ada) fit horribly. I returned that and got a pretty good fitting one from Napa.
RockAuto lists ones from "Vista-Pro" and "Pro-Part". Who they are, I do not know. When all else fails, you can use the old adage of "you get what you pay for" and the Vista-Pro is the most expensive of that bunch. I trust most stuff from RockAuto.
1992 XJ 2" lift -- RIP
2000 XJ 3" lift -- Australian Ford Big Brakes up front, rock rails, ZJ rear discs (with WORKING parking brake), C4x4 rear bumper/tire carrier, Hella H4 headlights, IPF driving lights, OEM skid plates, OME springs/shocks, JKS LCA's, JKS Sway Bar links.