PowertraxONE Retractable Tonneau Cover Retractable Tonneau Cover; w/Wide RETRAX Rail; One Piece Polycarbonate Construction CHEVROLET GMC SIERRA 1500 SIERRA 2500 HD SIERRA 3500 HD SILVERADO 1500 SILVERADO 2500 HD SILVERADO 3500 HD BASE DENALI HIGH COUNTRY LS LT LTZ SLE SLT SSV WT 2014 2015 2016 4.3L LV3 (262) Vortec 5.3L Ecotec3 L83 (325) 6.2L Ecotec3 L86 (376) 6.6L Duramax Turbo Diesel LML (400) 6L GEN IV CNG LC8 Vortec (364) 6L GEN IV Flex L96 Vortec (364) 6L GEN IV Flex LC8 Vortec (364) 6L GEN IV L96 Vortec (364) 6L GEN IV LC8 Vortec (364) CNG DIESEL FLEX GAS Retrax Retrax PowertraxONE Retractable Tonneau Cover - 20472 20472 Tonneau Cover