Are there any other differences outside of the larger bolt? I looked at the website and couldn't decipher the differences other than a larger bolt and maybe poly bushing at the axle mount?
the poly bushing is one difference. I prefer the stock Clevite two stage bushing.
the other difference between the various JKS bars is where the tube is welded on in relation to the joint, so that at full droop you avoid maxing out the misalignment capabilities of the joint. the bends may be different at higher lift height specs, i don't know.
you theoretically want the joint in a neutral orientation at ride height, assuming you have equal uptravel & downtravel....or at least have it neutral at the 50/50 point of the suspension travel, and not max it out misalignment at full droop.
this is the downside to single shear in the front track bar mount, you can
run out of travel at the frame end....depending on shock lengths
In a low lift situation requiring less than 2" of bumpstop extension to meet all other clearance parameters the jks 126 with a v8 zj tie rod is my first choice in aftermarket track bars under 3" of lift. At about 3" the metal cloak gets the win if the lesser than 2" bumpstop extension to meet other parameters still holds.
x2...JKS #126 with V8 ZJ tie-rod up to about 3" of lift, when requiring very little bumpstop extension. MC/Currie above that, when 2"-2.5" bumpstop extensions become necessary. People have made the Currie stuff work with less bump tho, just takes some detailed work with axle position. MC works down to nearly 0" bumpstop extension with the stock diff cover and tie-rod, but the adjustment range is limited, and its designed to center the axle in the 3.5-4" lift range.
and honestly, if you have a 0-2" lift there is really not much reason to use an adjustable front track bar. just stick with stock and either modify it to center the axle or just live with it off-center.