Chevy DuramaxTransmission Oil CoolerFits2001-2005 Chevy Silverado/GMCSierra with 6.6L engine.OEM FitmentOne Year WarrantyHeavy Duty Transmission Oil Cooler Core Dimensions 12-1/2″ x 7-3/4″ x 2″Overall Length 16″ Cooler Fittings: 7/8″-14 UNF on 12-1/2″ CentersIncludes Mounting Kit1SET OF QC ADAPTERS (5/8 QC x 7/8-14 UNF x 22mm I.D. FOR YEARS 2001-20031SET OF QC ADAPTERS (5/8 QC x 7/8-14 UNF x 21mm I.D. FOR YEARS 2003-20051LONG BRACKET2SHORT LBRACKETS8 EACH: M6 BOLTS, FLAT WASHERS, LOCK NUTS