A sample from the products for the Rear Fender include: Collar 9x12x4.5, Fender B,rr., Nut,flange,6mm, Bolt,flang,6x16.
The Nut,flange,6mm is the cheapest item from this partsfiche.
ten components are shown in this Xr500 1979 (z) Usa Rear Fender exploded diagram.