On this parts fiche the Lamp-assy-head is the most specified component.
Parts such as the Headlight(s)/ignition Switch: Lamp-assy-head, Key-lock,blank, Key-lock,blank, Switch-assy-ignition are included in the Kaf620-a5 Mule2510 1999 Europe Headlight(s)/ignition Switch parts fiche.
The Kaf620-a5 Mule2510 1999 Europe Headlight(s)/ignition Switch consists of five pieces with the Switch-assy-ignition being the most expensive.