The lowest price component in this Rear Cushion Lever parts-list fiche is the Nut 12mm.
Some items from this specific schematic: Washer, Cover,rr Swgarm Dust Seal, Spacer,rr Cushion Lever, Nut 12mm.
The Rear Cushion Lever is made up of components including this Lever Set,rear Cushion which is the most expensive.