Parts such as the Oil Pump: Gasket,oil Pump (nas), Hose,no.2, Hose, Nut are included in the Zr50sk 1987 (h) (e02 E16 E21) Oil Pump parts fiche.
The lowest price component in this Oil Pump parts-list fiche is the Screw.
The Oil Pump is made up of components including this Pump Assy,oil which is the most expensive.
