The lowest price component in this Oil Pump parts-list fiche is the Screw,cross 5x10.
Some items from this specific schematic: Oil Pump Assy, Gskt,pump Body (nas), Screw,cross 6x16, Rotor,outer.
The Screw,cross 5x10 is the most widely applied product in the C50LM LITTLE CUB 1999 (X) JAPAN OIL PUMP ( three times ).