The Washer,8.5x16x1.2 is the lowest priced item on this Brake Pedal schematic.
Parts such as the Brake Pedal: Washer,15.5x24x1.6, Pin, Pin-cotter,2.5x25, Washer,8.5x16x1.2 are included in the Klf400-b6 Bayou4004x4 1998 Usa California Canada Brake Pedal parts fiche.
On this parts fiche the O Ring,15mm is the most specified component.