IIRC rear sway bars are the same an all XJs (if it was equipped with one from the factory), but there are a couple different diameters for the front sway bar.
I've had the thickest one an all of my XJs, and seems to me all the XJs sold here in Finland have had the 28mm version. I've seen a couple import models that came with the thinner ones.
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***