Check out this JK adjustable track bar from Rubicon Express.
RE specializes in Jeep lift kits and suspension parts that are made to handle the toughest of trails -- like the Rubicon Trail which we do several times every summer. This stuff holds up to abuse. It's well made and strong as heck.
Rubicon Express is one of our Premier Sponsors and we're proud to have this awesome product family on our Jeep. Check them out at http://www.rubiconexpress.com/