On this parts fiche the Bulb 12v 3w is the most specified component.
The component with the lowest price in the METERS/IGNITION SWITCH ('79-'81 schematic is the Washer-plain,6mm.
thirty-six components are shown in this Kz1000c4 Police 1000 1981 Usa Canada Meters/ignition Switch ('79-'81 exploded diagram.