The Peterbilt Unibilt XL Standard 6 Inch Conversion Kit is a practical and efficient solution for enhancing your Peterbilt Unibilt XL truck. This kit includes a 6-inch cab extender, pre-assembled fiberglass panel, and a window for added convenience. With a pre-installed sound deadening core and CNC cut and drilled precision fit, this kit ensures a seamless integration with your factory rivet line. The Class A gel coat finish and OEM upholstery add a touch of elegance, while the diamond plate tool tray offers practicality. Sold as a kit and compatible with most Peterbilt Unibilt XL models, this conversion kit is a must-have for truck enthusiasts.