Check out any of the twenty-eight Turn Signal Lamp (gs750b components enlisted.
A sample from the products for the Turn Signal Lamp (gs750b include: Lamp Assembly,front Turn Signal, Gasket (nas), Bulb(12v23w,stanley,a4577a), Relay,turn Signal.
The most reasonably priced component used on the Gs750 1979 (n) Usa (e03) Turn Signal Lamp (gs750b is the Screw.