This OIL PUMP assembly utilises four O Ring(d:3.7,id:21.7)(s) - the highest specified component.
The Pin is the lowest priced item on this Oil Pump schematic.
Some items from this specific schematic: Bolt(6x30), Gear,oil Pump Driven(nt:37), Circlip,12 Mm, O Ring(d:3.2,id:17.8).