The lowest price component in this Swingarm/chain Case parts-list fiche is the Screw,flat 5x12.
Some items from this specific schematic: Nut,flange,16mm, Washer,plain,16mm, Dust Seal 23x35x5, Bolt,spl 6mm.
This SWINGARM/CHAIN CASE assembly utilises two Screw,flat 5x12(s) - the highest specified component.