The lowest price component in this Turnsignal parts-list fiche is the Screw, Lens Fitting.
This Turnsignal diagram displays the required parts for the Rd350 1973 Usa Turnsignal.
A sample from the products for the Turnsignal include: Collar, Flasher Front, Cord, Bulb, Flasher (12v-32cp) (256-83311-70), Screw, Lens Fitting.