Nfab N-Durastep Nerf Step, with Bed Access NDC01105CC-6 Bed Access CHEVROLET GMC SIERRA 2500 SIERRA 2500 HD SILVERADO 2500 SILVERADO 2500 HD BASE LS LT SL SLE SLT WT 2001 2002 2003 2004 2005 2006 6.6L Duramax Turbo Diesel LB7 (403) 6.6L Duramax Turbo Diesel LBZ (403) 6.6L Duramax Turbo Diesel LLY (403) 6L GEN III Bi-Fuel LQ4 Vortec (364) 6L GEN III CNG LQ4 Vortec (364) 6L GEN III LQ4 Vortec (364) 8.1L L18 Vortec (496) BI-FUEL CNG DIESEL GAS Nfab N-FAB N-Durastep Bed Access Nerf Step Bars (Black) - NDC01105CC-6 NDC01105CC-6 Nerf/Step Bar Wheel to Wheel