The OEM part source I know of only lists one size molding for the later XJ's, and that is about 2.5 inches wide. The only difference is if it is colored to match the body color or just gray/black.
Here is the link: http://www.jeepoemparts.com/jeep-cherokee-xj-parts.html
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.