On this parts fiche the Nut, Flange(6t3) is the most specified component.
The Flasher Light assembly is constructed from several parts from which the Rear Flasher Light Assy 1 is the most expensive.
A sample from the products for the Flasher Light include: Lens, Flasher, Flasher Light Assy 2, Ybs83-420 Screw,panh,tapping, Lens, Flasher 2.