Body > Rocker Panel > Step Nerf Bar. E-Series 3 Round Nerf Step Bars. 2019 Silverado LD/Sierra 1500 Limited. Westin designs and delivers automotive products that give you the look and function you need to fit your active lifestyle. When you choose Westin®, you roll with style. Westin Automotive products are proudly designed, tested and engineered in San Dimas, California, USA. Innovation, passion and consistency have made Westin one of the industry's leading manufacturers for nearly 40 years. When it comes to your vehicle, Westin is the name you can trust.