Nfab Step Systems N-Durastep, Wheel to Wheel NDC07115CC-6 Bed Access CHEVROLET GMC SIERRA 2500 HD SIERRA 2500 HD CLASSIC SIERRA 3500 CLASSIC SIERRA 3500 HD SILVERADO 2500 HD SILVERADO 2500 HD CLASSIC SILVERADO 3500 CLASSIC SILVERADO 3500 HD CLASSIC LT CLASSIC SL CLASSIC SLE CLASSIC SLT CLASSIC WT LT LTZ SLE SLT WT 2007 2008 2009 2010 6.6L Duramax Turbo Diesel LBZ (403) 6.6L Duramax Turbo Diesel LMM (403) 6L GEN III LQ4 Vortec (364) 6L GEN IV Flex L96 Vortec (364) 6L GEN IV LY6 Vortec (364) 8.1L L18 Vortec (496) DIESEL FLEX GAS Nfab N-FAB N-Durastep Bed Access Nerf Step Bars (Black) - NDC07115CC-6 NDC07115CC-6 Nerf/Step Bar Wheel to Wheel