Some items from this specific schematic: Nut,12mm, Bar-footrest,r.h, Washer-plain,8mm, Nut,10mm.
The most reasonably priced component used on the Kh500a8 1976 Canada Footrests/stands/brake Pedal ('7 is the Washer-plain.
With two applications this Washer-plain is the most specified part.