Parts such as the Rear Brake Panel: Cam,fr.brake, Indicator,rr, Washer, Handle, Rubber Cushion are included in the Cb250 1994 (r) Belgium Rear Brake Panel parts fiche.
In this schematic the "Spring Brake Shoe" is used most often.
The most reasonably priced component used on the Cb250 1994 (r) Belgium Rear Brake Panel is the Nut,hex.,8mm.