The most reasonably priced component used on the Cb250n 1980 (a) England Winker is the Screw,tapping4x25.
This schematic depicts all components used in the Cb250n 1980 (a) England Winker partslist.
Parts such as the Winker: Collar,winker, Lens,winker, Seal,gasket, Base Comp,l.rr. are included in the Cb250n 1980 (a) England Winker parts fiche.