Buyers Products Quarter Poly Fenders for Dual Rear Wheels have an integrated 5.5″ top poly flap extension for added protection. The fenders are constructed from 100% polypropylene and will not rust or corrode. The fenders are durable, lightweight, and forgiving.They take a beating so the rest of your truck doesn’t have to. Mounting kit sold separately (Part Number 8592425). See below for more information.