RED LABEL AIR SPRINGS 11-26 GM HD (EXC CAB & CHASSIS & AT4X/ZR2)FIRESTONE RED LABEL REAR AIR HELPER SPRINGS ; 11 26 SILVERADO SIERRA HD (EXCLUDING CAB AND CHASSIS AND AT4X ZR2) Assembled In The Usa No Drill Installation This Kit Uses Existing Holes In The Frame To Mount The Upper And Lower Brackets. Modification Of The Frame Or Factory Suspension Is Required. Installing This Kit Does Not Void The Factory Warranty Compatible With In Bed Hitches Rated Up To 7,500 Lbs. Of Carry Capacity Manual Fill Compressor Not