Nfab N-Durastep Nerf Step, with Bed Access NDC11100QC-6 Bed Access CHEVROLET GMC SIERRA 2500 HD SILVERADO 2500 HD LT LTZ SLE SLT WT 2011 2012 2013 6.6L Duramax Turbo Diesel LGH (403) 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) CNG DIESEL FLEX GAS Nfab N-FAB N-Durastep Bed Access Nerf Step Bars (Black) - NDC11100QC-6 NDC11100QC-6 Nerf/Step Bar Wheel to Wheel