Pro Comp 58252 2.5" Rear Block Kit for GM 2500 73-91 Pro Comp Suspension 58252 Block With U-Bolt Kit; 2.5 in. Lift; Incl. 2 Cast Iron Riser Blocks; 4 U-Bolts; 8 Heavy Duty Flatwashers; 8 Hi-Nuts; Authorized Dealer - 100% Satisfaction Guaranteed Pro Comp Suspension 58252 Warranty: Yes