A sample from the products for the Rear Hub/brake ('74-'75) include: Rear Sprocket,54t, Panel Asy,rr Bk,buff, Bearing-ball,#6004c3, Bolt, 6x22.
The Nut,8mm is the lowest priced item on this Rear Hub/brake ('74-'75) schematic.
On this parts fiche the Nut,8mm is the most specified component.