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Looks like they use some sort of 7" round sealed beam light so you could probably just use a modern dot approved LED like I have on my Range Rover classic, the output is much better than the turbos lights, It would give you the same flat round look with an more modern twist. It would be really easy to fabricate. There is a lot of mounts for those lights, a very simple shroud(which I bet someone has) and attach the lens to the body work.
RSR lights available through Porsche Motorsport I think. Bit related to this, I asked few years ago if race spec projector headlights would be something as in the record-breaking Alzen Turbo but no interest, http://rennlist.com/forums/996-gt2-g...eadlights.html