With all the components that make up the GSX1100F 1993 (P) USA (E03) OIL PUMP assembly. The O Ring(d:3.7,id:21.7) is the most frequently specified with four applications.
The Pin is the lowest priced item on this Oil Pump schematic.
Some items from this specific schematic: Pipe,oil Outlet Under,l, Circlip, O Ring,oil Pump, O Ring(d:3.7,id:21.7).