Parts such as the Oil Pump: Rotor,outer, Screen, Filter, Gskt,pump Body (nas), Rotor,inner are included in the Z50r 1995 (s) Usa Oil Pump parts fiche.
The most reasonably priced component used on the Z50r 1995 (s) Usa Oil Pump is the Screw,cross 5x10.
With three applications this Screw,cross 5x10 is the most specified part.