On this parts fiche the Screw, Pan Head is the most specified component.
Parts such as the Flasher Light: 01416 10w 12v, 01416 10w 12v, Lens, Flasher, 01416 10w 12v are included in the Ew50 2003 5wk1 England 1b5wk-300f1 Flasher Light parts fiche.
The most expensive part in this assembly is the Rear Flasher 1.
