On this parts fiche the Clip 101235600 is the most specified component.
Parts such as the Oil Pump: Gasket, Breather Bolt (nas), Pipe, Oil 2, Gear, Pump Drive, Hose (l485) are included in the Ew50 2003 5wk1 Holland 1b5wk-300f1 Oil Pump parts fiche.
Of all the components that make up this Oil Pump the Gasket, Breather Bolt (nas) has the lowest price.