I believe the metal cloaks are close to the bucks and you don't have to drill and tap.
Also in the rear I added my spacers above the jounce cups so again I didn't need to drill and tap.
http://www.metalcloak.com/Adjustable-Bump-Stop-System-1-4-p/7040.htm
pretty reasonably priced and where I am going to go if I need to.
Those say universal but I believe if you look on there site they do have some made specifically for the TJ but with less pucks
Yes, they require drilling and tapping. No way to install bump stops without doing it that way. Not that I can think of at least.