I just replaced mine with booms and some rubber bushings. I do have greasable shackles though. The rubber ones may seem too long but they are not unless they are not the right bushing. They should be compressed. I went with the rubber because it was what I could afford right now. I will be upgrading when they are ready to be replaced again. My sets were two shackles worth of bushings (8 bushings).
92 XJ, 4.0 NP231 - Stock to rebuild for my daughter, 235x75R15s
95 YJ, 2.5 NP231- 1" shackle, 4.0 tb, 19lbs injectors, e-fan, 31x10.5R15 Treadwright tires.
93 ZJ, 4.0 w/AW4 NP231 - 2" BB, 1 inch spring lift, 31x10.5R15 Cooper AT3 tires.
In GOD we trust. It's a Jesus thing.