On this parts fiche the Nut (4h1) is the most specified component.
Parts such as the Turnsignal: Front Flasher Light Assy 1, Cap, Lens Flasher, Lens Flasher are included in the Tw200 Trailway 1987 (h) Usa Turnsignal parts fiche.
Of all the components that make up this Turnsignal the Screw, Tapping has the lowest price.