The Nut,6mm is the lowest priced item on this Brake Pedal schematic.
Parts such as the Brake Pedal: Washer-plain-small,6m, Bracket,brake Pedal, Bolt, Hex Head, 10x25, Washer-spring,10mm are included in the Kz1300a3 1981 Usa Canada Brake Pedal parts fiche.
On this parts fiche the Washer-plain-small,10 is the most specified component.