This F-6 assembly utilises four Bolt-washer,6x12(s) - the highest specified component.
Some items from this specific schematic: Bolt-washer,6x12, Seal,maint.lid (jdm), Bolt-washer,6x35, Clip,trim.
The lowest price component in this F-6 parts-list fiche is the Screw 5x12.