The component with the lowest price in the OIL PUMP schematic is the Bolt, Hex., 6x35.
A sample from the products for the Oil Pump include: Pin,dowel,8x18, Bolt, Hex., 6x35, Plate,pump Settin, Screw,cross,5x12.
thirteen components are shown in this Cb250rs 1980 (a) European Direct Sales Oil Pump exploded diagram.