All of our Fenderskirts are universal and are aftermarket. They may fit and are not limited to RVís and Motorhomes such as Fleetwood, Winnebago, ForestRiver, Thor, Skyline, Monaco etc. The S321S is a single axle fenderskirt made of plastic that comes in Smooth Polar White. Sold individually. In stock and available for immediate shipment from both our California and Georgia locations.