Some items from this specific schematic: Bolt,flange, 6x32, Dowel,pin,8x14, Bolt,hex 6x8, Spro,oilpumpdrive.
twenty-one components are shown in this Cx500 1978 France Oil Pump - Primary Drive Gear exploded diagram.
Of all the components used in this assembly the Pump Assy.,oil is the most expensive.