Never seen this before, must be kind new or really old...

http://www.jcwhitney.com/autoparts/Prod ... 09/c-10101

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Pre-Lowered 02 Liberty
2.5" Rustys Coil w/ Ranchos in the rear.
ARB, OME927's, 1/4 strut plate and Als Gen 4.5 Uppers in the front.
Flowmaster Super 40 Series (GONE, SO QUIET!)
245/75/16 Kumho KL-78 w/ Spidertraxxxxx
Ripped out the plastic inner wheel liners
Herculined ALLLL over.....

I had them on mine, but they put added strain on the shock.

Just do yourself a favor:

-Go to a sporting goods store, and buy 4 hockey pucks
-Go to the hardware store, buy two 3" 3/8ths inch hex topped bolts with appropriately sized nuts and washers
-Make each bumpstop by gluing two hockey pucks to each other
-Let glue dry (best to let it sit for a day)
-Drill 3/8ths inch hole in the middle of each bumpstop
-Insert bolt, with washer on the same side as the top of the bolt
-Take apart your rear suspension
-Drill a 3/8ths inch hole in the middle of your spring pad on both sides (left and right)
-Insert bumptops
-Tighten nuts (NOT TOO TIGHT!)
-Put rear suspension back together

I've spent a relatively large amount of money (~60) on rear bumpstop configurations for the KJ, and this is the one I am currently using.

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Have fun out there.

2003 Cactus Green Renegade w/ NP231 & NV3550
Al's 4th Gen UCAs
Custom 3.5" Lift
Rear DTT
Spidertraxed 245/75/16 Maxxis Bighorns