Nfab N-Durastep Nerf Step, with Bed Access NDC11115CC-6 Bed Access CHEVROLET GMC SIERRA 2500 HD SIERRA 3500 HD SILVERADO 2500 HD SILVERADO 3500 HD DENALI LT LTZ SLE SLT WT 2011 2012 2013 2014 6.6L Duramax Turbo Diesel LGH (403) 6.6L Duramax Turbo Diesel LML (400) 6.6L Duramax Turbo Diesel LML (403) 6L GEN IV CNG LC8 Vortec (364) 6L GEN IV Flex L96 Vortec (364) 6L GEN IV L96 Vortec (364) 6L GEN IV LC8 Vortec (364) CNG DIESEL FLEX GAS Nfab N-FAB N-Durastep Bed Access Nerf Step Bars (Black) - NDC11115CC-6 NDC11115CC-6 Nerf/Step Bar Wheel to Wheel