This part generally fits Chevrolet,GMC vehicles and includes models such as Sierra 2500 HD,Sierra 3500,Silverado 2500 HD,Silverado 3500 with the trims of Base Cab & Chassis 2-Door,Base Cab & Chassis 4-Door,Base Crew Cab Pickup 4-Door,Base Extended Cab Pickup 4-Door,Base Standard Cab Pickup 2-Door,HD Standard Cab Pickup 2-Door,LS Cab & Chassis 2-Door,LS Cab & Chassis 4-Doo r,LS Crew Cab Pickup 4-Door,LS Extended Cab Pickup 4-Door,LS Standard Cab Pickup 2-Door,LT Crew Cab Pickup 4-Door,LT Extended Cab Pickup 4-Door,SL Cab & Chassis 2-Door,SL Cab & Chassis 4-Door,SL Crew Cab Pickup 4-Door,SL Extended Cab Pickup 4-Door,SL S tandard Cab Pickup 2-Door,SLE Cab & Chassis 2-Door,SLE Cab & Chassis 4-Door,SLE Crew Cab Pickup 4-Door,SLE Extended Cab Pi ckup 4-Door,SLE Standard Cab Pickup 2-Door,SLT Crew Cab Pickup 4-Door,SLT Extended Cab Pickup 4-Door,WT Cab & Chassis 2-Door,W T Cab & Chassis 4-Door,WT Crew Cab Pickup 4-Door,WT Extended Cab Pickup 4-Door,WT Standard Cab Pickup 2-Door. The engine types may include 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated,6.0L 5967CC 364Cu. In. V8 BI-FUEL OHV Naturally Aspirated,6.0L 5967CC 364Cu. In. V8 CNG OHV Naturally Aspirated,6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated,6.6L 6599CC 403Cu. In. V8 DIESEL O HV Turbocharged,8.1L 496Cu. In. V8 GAS OHV Naturally Aspirated. This part fits vehicles made in the following years 2001,2002,2003 ,2004,2005.