Liquid Iron Industries SBK - Universal Weld On Slider Box Kit Replaces shackles in ordinary leaf spring suspensions Modular weld on design can be used front or rear and for standard or shackle reversal setups Designed to be used with typical 2.5" wide leaf springs with a maximum bushing width of 3" Heavy duty 1/4" steel construction is CNC laser cut and bent for rock solid reliability UHMW slider pucks are self lubricating to provide years of trouble free service