When I purchased my XJ, the previous onwer welded the rear shocks to a set of home made extensions ( a bolt, stacked washers, two nuts, and welding slag). Over time I broke this hack job. So this is my fix.

The JKS crossmember is well built, adjustable, and fit perfectly.
Very simple to install. Most of the work is in the time it takes to drill out old mounts. ( If your mounts are still intact you can use them as opposed to what I had to do) I posted pics as project progressed.

Sorry no action shots, Kinda hard to hold camara and work at same time.