I find it fascinating from an engineering perspective. It seems to represent a transitional period from a time when things were generic in the early 70’s and all bl cars used the same switches and lights and fittings and fixtures to a time later in the 80s when everything was bespoke and nothing was interchangeable. There’s lots of multi way electrical connectors each colour coded and uniquely shaped to aid assembly. Yet the headlights are still sealed beam units!
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IIRC, they are just the same units as Classic Mini so easy to swop to Halogen or even LED