93-97 Zj rear disc is what I used on my 94 xj rear with the 8.25 just have to hone the center of the backing plate out a 1/8 inch or till it fits the tube and its bolt on you will need the bolts from the Zj axle tube to bolt on as there longer and replace your wheel studs with xj front studs or Zj studs if your running aluminum wheels. I also upgraded my master cylinder and booster,proportion valve with the 96 xj now it stops on a dime and holds on hills.