The most reasonably priced component used on the Kle500a10 2000 Is Oil Pump is the Circlip-type-c,11mm.
Parts such as the Oil Pump: Screw-pan Head,6x16, Bolt,6x12, Bolt-flanged-small, Rotor-pump,outer are included in the Kle500a10 2000 Is Oil Pump parts fiche.
This OIL PUMP assembly utilises four Screw-pan Head,6x16(s) - the highest specified component.