Rubicon Express if you want the cross brace.
I was going to suggest the TnT track bar, but I can't find them on their website so I don't know if they offer them anymore. We put one on my dads XJ and it was beautiful.
Stinkyfab also offers a bracket and cross brace if you want to go more custom route:
https://www.stinkyfab.com/products/sfr-heavy-duty-xj-mj-zj-track-bar-bracket?pr_prod_strat=copurchase&pr_rec_pid=4439943086216
I have also done a couple stitch welds from the bracket to the unibody to prevent as much movement as possible on a couple Jeeps in the past as well.