Of all the components that make up this Speedometer (or50t) the Nut has the lowest price.
Some items from this specific schematic: Bulb(6v/3w), Socket,meter, Bulb(6v1.7w,stanley,a61a), Bolt.
The Bulb(6v/3w) is the most widely applied product in the OR50 1979 1980 (N) (T) USA (E03) SPEEDOMETER (OR50T) ( three times ).