The Peterbilt Ultracab XL DIY 6 Inch Conversion Kit is a practical and convenient solution for extending the cab of your Peterbilt Ultracab XL. This kit includes a pre-assembled fiberglass panel with a window, making installation a breeze. The pre-installed sound deadening core ensures a quieter ride, while the CNC cut and drilled design ensures a precise fit to the factory rivet line. With its class A gel coat finish, this kit is not only functional but also visually appealing. Sold as a kit, it fits most Peterbilt Ultracab XL models, making it a versatile and beneficial addition to your truck.