In this schematic the "Bolt" is used most often.
Parts such as the Oil Pump: Circlip(24h), Gear, Pump Idle 2 (15t), Pin, Dowel, Gear, Pump Driven (28t) are included in the Xvz12td Venture Royale 1983 (d) Usa Oil Pump parts fiche.
The most reasonably priced component used on the Xvz12td Venture Royale 1983 (d) Usa Oil Pump is the Bolt.