I am not sure if you can find a
brand new, NOS set of 036 headlights for USD3500.
@gerryvz has been using a EUR5000 figure for years, mostly in jest, but I think that’s closer and closer to reality now, if not already reality.
For example, in
this thread, the seller is asking USD4000 for NOS lenses (not the entire headlight). As well in that thread,
@northNH mentioned that he sold a new set of headlights 2-3 years ago for USD3.5K back then …. And that he, as the seller, felt like a thief back then, and that the buyer today now probably feels like the thief!
Anyways, the ultra valuable part, if you already have a set of new lenses, is the lens itself … with the special inboard fluting and the mirror interior finish. If you have a set of lenses already, you could graft them onto a set of pedestrian restored w124 headlight housings and it would look exactly the same as NOS real 036 headlights and only you and concours judges would know the difference …..
Good luck with the search - hope you find what you are looking for at an acceptable price!