This Regulator is the most expensive of the items that make up this Left Side Cover - Electric Plate assembly.
The component with the lowest price in the LEFT SIDE COVER - ELECTRIC PLATE schematic is the Spg/washer,6mm.
Parts such as the Left Side Cover - Electric Plate: Washer,18mm, Fuse,15a, Fuse,7a, Case,gromet are included in the Cb550f2 Super Sport 550 Four 1977 European Direct Sales Left Side Cover - Electric Plate parts fiche.