It's been done, just be aware there will be issues with the Trackbar and your Lower control arms. Remeber to extend brakelines and such and get ready for driveline modifications as well. You may need an SYE depending on your year of XJ.
Just get an ADJ. Track Bar, I recomend either RE or ORGS/JKS. Rusty's works but depending on what you plan to do later, the others can be modified easier.
You should look at longer LCA's to fix your wheelbase, the front springs may bow. RE, JKS or Rusty's will work fine. You may even consider Longarms, Midarms or drop brackets, at 5" of lift the CA angles are starting to get steep, and this makes your XJ ride like crap.
RE has both Drop Brackets and braces. Trail Master has Brackets and the RE braces can work with them. They are the only two out there, that's why LA kits are very comparible.