The lowest price component in this Oil Pump - Primary Drive Gear parts-list fiche is the Bolt,hex 6x8.
twenty-one components are listed in the schematic for this Cx500c Custom 1981 (b) Italy Oil Pump - Primary Drive Gear .
Some items from this specific schematic: Chain,oil Pump, Bolt,flange,6x25, Spro,oilpumpdrive, O-ring,11.8x2.4.