Optional add on available for long bed or short bed (choose below). Long bed assumes a 56″ cab to center of axle measurement. Short bed assumes a 38″ cab to center axle measurement. If you have a longer cab to axle measurement than described, you may need to shorten the rear section to allow the axle to be centered on the wheel cutout. This product is designed to fit seamlessly with any model made using our blueprints and video tutorial. Includes both driver and passenger side. Rear section is 3″ deep, front section tapers from 3″ to 4.5″ deep (see photos). Made from 3/16″ thick steel.