The Peterbilt 388 Narrow Cowl Extension is a practical and versatile product designed to enhance your truck's functionality. Made of stainless steel, it comes with 4 Super 21 light holes per cowl extension, allowing for customizable lighting options. This extension is compatible with regular cab and day panels, fitting most Peterbilt 388 makes and models. It is also suitable for trucks with set back DPF and passenger side Kenworth style box. However, it is not compatible with 388 low profile trucks. Please contact us for more information on available light styles and options.