MORryde UO12-016 Heavy Duty Shackle Upgrade Kit, CRE3000 / Stock / Equaflex 2.25" Shackles - Tandem Axle Thicker shackles for added strength Bronze bushings for more durability Greasable bolts for less maintenance Fits CRE3000, Stock and Equaflex with 2.25" shackles Tandem Axle