Some items from this specific schematic: Lever-assy-change,ped, Circlip-type-c,12mm, Washer,12.5x22x1.2, Bolt, Hex Head, 10x26.
The lowest price component in this Gear Change Mechanism parts-list fiche is the Circlip-type-c,12mm.
In this schematic the "Washer,12.5x22x1.2" is used most often.