Westin 203715 GenX Nerf Bar, Black Westin, 20-3715, GenX 4 in. Oval Nerf Step Bar Cab Length, Incl. Mount Kit - 2 Drop Down Nerf Steps - Black Powdercoat - Rocker Mount Nerf/Step Bar,Side Steps and Nerf Bars,Exterior Accessories,GenX 4 in. Oval Nerf Step Bar Cab Length,20-3715,Westin,Sierra 1500, Sierra 2500 HD, Sierra 3500 HD, Silverado 1500, Silverado 2500 HD, Silverado 3500 HD, Chevrolet, GMC, 2016, 2015, 2014