The lowest price component in this Gearshift Drum parts-list fiche is the Circlip,ex,14.
Parts such as the Gearshift Drum: Bolt,flange 6x16, Drum,gearshift, Stpr Comp Drum, Shaft,shift Fork are included in the Cr250r Elsinore 1990 (l) Usa Gearshift Drum parts fiche.
In this schematic the "Bolt,flange 6x16" is used most often.