I've wondered the same thing. Of all the pictures I have of the Original road cars, none have backup lights with the exception of this car. I think they were added later, but don't have a source for them.
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They look too small to be a driving light to me ? In the UK a reversing lamp should really only have a 21watt bulb anyway.
The ones pictured look very much like Cortina 1600E reversing lamps, which I think were made by Wipac. Google 1600E reversing lamps.
<p>Polished stainless steel body (110mm x 55mm x 80mm deep) with polycarbonate lens. Single bolt fixing allows choice of mounting. Ball joint mounting with spri