The product is an OEM rear right side axle shaft halfshaft for a Ford Mustang 5.2L, manufactured by Fomoco. The part numbers associated with this product are FR3Z4K138C / FR3Z4K138 / FR3Z-4K138-C, FR3Z4K138F / FR3Z4K138 / FR3Z-4K138-F, and FR3V4K138AA / FR3V4K138 / FR3V-4K138-AA. It is designed for specific placement on the vehicle, in the rear and on the right side. This axle shaft is not a performance part and is not a vintage part. Made for Ford Mustang models from 2015 to 2020, this OEM part ensures proper fitment and functionality for the vehicle.