These polyurethane fenders are the ideal alternative to standard rubber fenders. They are actually cheaper than replica rubber fenders and should last a lot longer! While polyurethane bushings are sometimes frowned upon for the everyday driver due to their tendency to squeak over time, using polyurethane for a jounce bumper shouldn't be a problem. This product is not complete. If in doubt, contact one of the other popular auto parts suppliers and double check the part number. I install them inβ¦