On this parts fiche the Bolt 6x25 is the most specified component.
The component with the lowest price in the OIL PAN-OIL PUMP schematic is the O Ring(d:3.2,id:15.8).
A sample from the products for the Oil Pan-oil Pump include: Gasket(14x19.2x2) (nas), Gasket,oil Outlet (nas), Plug, Protector,oil Strainer.