Parts such as the F-9: Shoe Set,brake (nas), Spring Brake Shoe, Dust-seal, Brake, Cam Rear Brake are included in the C50bnd 1995 (s) Japan C50-060 F-9 parts fiche.
In this schematic the "Spring Brake Shoe" is used most often.
The Washer,plain, 6mm is the lowest priced item on this F-9 schematic.