| Diagram | Fig. 21 — ELECTRICAL EQUIPMENT (Plate 14) · ref 24 |
| Listed in parts books | 1969–1973 |
Adaptor, main bulb (France and Europe)
A Lucas main-bulb adaptor for France and Europe spec headlamps, part 553738.
This is the main headlamp bulb adaptor listed for France and Europe fitment, part number 553738. It shows up across several electrical equipment plates in the parts books and also appears specifically in the headlamp figures for Fastback, Fastback L.R., Roadster, Interpol, and Interstate models, so it's tied to the headlamp assembly rather than any other part of the wiring.
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The part exists because bulb fittings and lighting regulations varied between the UK and continental markets, and this adaptor let the same headlamp shell take a bulb of a different pattern for export bikes sold on the continent. If your parts book calls out a France/Europe spec headlamp, this is the piece that bridges the bulb to the holder.
We don't have more detail on this one beyond the catalog listing itself. If you're trying to match it up with a specific model or year, call the shop and we'll confirm fitment before you order.
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