The most reasonably priced component used on the Xr80 1979 (z) Usa Rear Fender is the Bolt-washer,6x28.
The twenty Xr80 1979 (z) Usa Rear Fender component parts are all listed in this schematic.
This Fender B,rr*r-23* is the most expensive of the items that make up this Rear Fender assembly.
