Parts such as the Oil Pump/oil Filter/oil Pan: Spring,oil Filter, Cover-pump, Bolt,flanged,6x25, Shim-kick Shaft are included in the Kz650c3 Custom 1979 Usa Canada / Mph Kph Oil Pump/oil Filter/oil Pan parts fiche.
In this schematic the "Bolt,flanged,6x25" is used most often.