So to actually answer your question.
There are basically to types of Body Lifts that I have seen.
One uses little metal or aluminum spacers or "pucks" and go in between your original rubber bushing and the body thereby giving you your lift.
The other style uses polyurethane bushings that completely replace the factory rubber bushing.
There are pros and cons to both, but basically comes down to personal preference.
2000 TJ Sahara
4.0, 5 Speed, D30, D44 w/Detroit Truetrac, 4.56 gears
Rancho Lift, Body Lift, Motor Mount Lift, SYE & 33" tires