Just like the long title says. I have a brand new in the box Rock Krawler 3.5" XFactor long arm 4" stretch kit. Product Code: LJ35XFLA-4S This kit does not include shocks. I sold my LJ for and never got a chance to install it. $2800 new and yours for $2200 +shipping. Its in 14 boxes so if your local to socal I can deliver it to you.
I have no idea what else it would fit other than an LJ. I don't know where your pulling up for a JK as the part # has "LJ" in it. When I google this # it comes up for an LJ. My guess is that it will not work on a JK however you can call RK and ask them. They may have similar parts in the kits.