The Peterbilt 388 2007 And Newer And 389 2007-2013, 2018 Sleeper Extender Skirts are made of stainless steel and designed specifically for 78 inch sleeper models. These skirts seamlessly continue the sleeper skirts to the end of the factory sleeper extender, providing a sleek and polished look. Each skirt is 4 inches wide and features an amber/clear LED light for added visibility. Sold in pairs, this product includes all necessary hardware, harnesses, and lights. It fits most Peterbilt makes and models, including the 2007 and newer 388 and the 2007-2013, 2018 389.