I used skyjackers on my 93 with 5/8's bolts. They want you to not use the steel sleeve in the front bushings so the 5/8's bolt will fit. I didn't really like their idea so I made my own bushings and sleeves to work with their springs and my truck. I know of other people on here not running the sleeves with out any problem, I think I posted a question on it too. If I did it over again I would use my original main leaf, with the rest skyjacker leafs. then there would be no bushing problems.