Parts such as the Oil Tank: Screw,6x16, Tank-oil, Tube-pvc,5x440, Cap-oil,tank are included in the Kmx125-a14 Kmx125 2001 / Kph Oil Tank parts fiche.
Check out any of the four Oil Tank components enlisted.
The Tube-pvc,5x440 is the lowest priced item on this Oil Tank schematic.