The Peterbilt 359 Wide Cowl Extensions are a practical and beneficial addition to your truck. These stainless steel extensions replace the factory cowl and are designed to be used with 3.5 inch face cab panels and day cab panels. With 8 combo holes, they offer versatility and compatibility with most Peterbilt 388 makes and models. However, please note that they do not fit 388 low profile trucks, trucks with set forward DPF, or trucks with a passenger side Kenworth style box. Sold by pair, these cowl extensions are a reliable and functional choice for enhancing your truck's appearance.