On this parts fiche the Stud,8x15, is the most specified component.
twenty-one components are listed in the schematic for this Ar50a1 1982 Usa Rear Wheel/hub/brake/chain .
A sample from the products for the Rear Wheel/hub/brake/chain include: Nut,8m/m, Axle,rr,l=200, Washer, Sprocket-hub,46t.