Parts such as the Oil Pump: Washer,plain,6mm, O-ring,15x2.5, Spring,relief, O Ring, 15x2.5 are included in the Cb750k4 Four 1974 Usa Oil Pump parts fiche.
The Oil Pump assembly is constructed from several parts from which the Body,oil.pump is the most expensive.
Of all the components that make up this Oil Pump the Washer,plain, 6mm has the lowest price.