The twelve Gd321\qaa\10zg401 Oil Pump component parts are all listed in this schematic.
The Screw,flat,6x16 is the lowest priced item on this Oil Pump schematic.
With all the components that make up the GD321\QAA\10ZG401 OIL PUMP assembly. The Screw,flat,6x16 is the most frequently specified with three applications.