The lowest price component in this Headlamp (e17,e18,e21,e22,e26,e34) parts-list fiche is the Screw.
This Headlamp Assy is the most expensive of the items that make up this Headlamp (e17,e18,e21,e22,e26,e34) assembly.
In this schematic the "Screw" is used most often.