On this parts fiche the Bulb(12v3.4w,stanley,a72a) is the most specified component.
The Spring,headlamp Adjust is the lowest priced item on this Speedometer-tachometer-head Lamp schematic.
This part-list fiche shows all the components that make up the T305 Tc305 1969 Usa (e03) Speedometer-tachometer-head Lamp .