On this parts fiche the Shoe,brake. (nas) is the most specified component.
Parts such as the F-8: Screw,oval,5x18, Spring,fr. Brake, Gear,speedometer, Panel Sub,fr.brak are included in the Mt50s 1980 (a) Belgium F-8 parts fiche.
The most reasonably priced component used on the Mt50s 1980 (a) Belgium F-8 is the Screw,oval,5x18.