Tyger Auto TG-RS2C40038 Riser for 2007-2018 Chevy Silverado/GMC Sierra 1500 & 2007-2019 2500/3500HD Extended/Double Cab 4" Black Side Step Nerf Bars Running Boards (1 Pack) IMPORTANT: Only fit Extended Cab & Double Cab with 2 full-size front doors & 2 narrower rear doors (Do not fit 2007 classic model). NOT for Crew Cab with 4 full-size doors. (Please check the Cab Size picture.) 100% brand new OE-style step bars for both driver & passenger sides. All mounting hardware and DIY instruction included Step bars are made of 4inch wide heavy duty triangle mild Steel tubing in Black powder-coating for rust-resistant with UV resistant non-slip wide step pads Rocker panel mount. Easy bolt-on installation. (Trimming needed on 2017-up models with plastic DEF tank cover) against manufacturing defects