I've seen clear lights at kragen that look exactly the same size. I think they are meant to be headlights for other cars, but they are clear, the right size, and most probably connect the same way. So you could just use them as fog lights...

I have seen W123s with white fog lights, both on the web and in person. I don't know if they were factory or aftermarket, but at any rate it is doable.

AA

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'82 300TD
'77 6.9
'75 280S
'74 280
'87 Porsche 944 turbo