The Pin-cotter,2.0x15 is the lowest priced item on this Step schematic.
Parts such as the Step: Holder-step,fr,lh, Pin-cotter,2.0x15, Holder-step,rr,rh, Bolt-upset,10x22 are included in the Ar50c3 1985 Europe Uk Gr St Step parts fiche.
On this parts fiche the Bar-rear Footrest is the most specified component.