This kit is built M.O.R.E. Bomb Proof. The Spring Perches and U-Bolt Plates are made out of 1/4" plate. The shock mounts are made out of 3/16" plate, unheard of thickness for these parts. 5/8" holes in U bolt plates for 9/16" U bolts.This is the most economical to lift your jeep suspension using our Spring Over Kit for Dana 60 axle. (U bolts not included). Lift you jeep 4-3/16" what ever the thickness of your spring pack is.