This Lamp Unit is the most expensive of the items that make up this Headlamp (gs1000ec assembly.
Some items from this specific schematic: Screw, Ring,headlamp Unit, Spacer (8.8x12x7), Bulb(12v60/55w,h4).
The component with the lowest price in the HEADLAMP (GS1000EC schematic is the Screw.