The Screw-pan Head,6x25 is the lowest priced item on this Oil Pump schematic.
Of all the components used in this assembly the Pump-assy-oil is the most expensive.
Parts such as the Oil Pump: Valve-assy-relief, Cap,oil Filter, Body, Piston are included in the Kl500-a1 Klr500 1987 Norway Ar Oil Pump parts fiche.