Check out any of the twenty-one Flasher Light components enlisted.
Parts such as the Flasher Light: Rear Flasher Light Assy 1, Screw, Tapping (1la), Screw, Tapping (1la), Gasket, Flasher Lens (nas) are included in the Tw200e 1994 3ly2 France 243ly-351f1 Flasher Light parts fiche.
On this parts fiche the Nut (4h1) is the most specified component.