Check out any of the twenty-nine Oil Pump ('76-'79) components enlisted.
Parts such as the Oil Pump ('76-'79): Seal-oil,camshaft,"x", Washer,6.1x12x1, Tube,oil, Circlip-type-e,7mm are included in the Ke125-a4 Ke125 1977 Usa Canada Oil Pump ('76-'79) parts fiche.
The Washer,6.1x12x1 is the cheapest item from this partsfiche.