Westin 1999-2013 Chevy Silverado 1500 Reg Cab E-Series 3 Nerf Step Bars - SSWestin(TM) E Series Nerf Bars are made of 3in. diameter round tubing and are vehicle specific designs. Step design and mounting technique varies by application (mounting kit included). They feature recessed area mounted step pads unique to E Series Nerf Bars feature the Westin(TM) brand name and are UV resistant. Installation Instructions This Part Fits: Year Make Model Submodel 1999 2005 Chevrolet Silverado 1500 Base 1999 2006 Chevrolet Silverado