On this parts fiche the Nut,10mm is the most specified component.
A sample from the products for the Rear Wheel/hub/brake/chain ('80 include: Panel-assy-brake,rr, Ring,snap,56.2m/m, Collar,17x35x19.5, Bolt-small,8x28.
thirty-one components are listed in the schematic for this Kz440a2 Ltd 1981 Usa Canada Rear Wheel/hub/brake/chain ('80 .