On this parts fiche the Washer-spring,6mm is the most specified component.
The forty-three Kz1000c4 Police 1000 1981 Usa Canada Footrests/stands/brake Pedal ('7 component parts are all listed in this schematic.
A sample from the products for the Footrests/stands/brake Pedal ('7 include: Nut,lh Thread, Footboard Bracket,lh, Washer-spring,8mm, Plate,footbrd, Skid.