Westin 203720 GenX Nerf Bar, Stainless Steel Westin, 20-3720, GenX 4 in. Oval Nerf Step Bar Cab Length, Incl. Mount Kit - 2 Drop Down Nerf Steps - Stainless Steel - Rocker Mount Nerf/Step Bar,Side Steps and Nerf Bars,Exterior Accessories,GenX 4 in. Oval Nerf Step Bar Cab Length,20-3720,Westin,1500, 2500, 3500, Sierra 1500, Sierra 2500 HD, Sierra 3500 HD, Silverado 1500, Silverado 2500 HD, Silverado 3500, Silverado 3500 Classic, Silverado 3500 HD, Chevrolet, GMC, Ram, 2016, 2015, 2014, 2013, 2012, 2011