Hi J.S., thanks for the update and info.! I am still somewhat unsure of exactly what parts to get for the 600D setup, so I have been sort of attempting to collect early 600 and 600D parts, and trying to piece together something that will work. If I knew exactly what 600D parts to get, and where to get them, I would have the set of early alloy rings and glass available for you... I am kinda thinking at this point, that I would rather have the somewhat incorrect early 600 alloy setup instead of the later (and larger) US chrome ringed setup.
I just bought one of the headlight bucket things in one of Trevor's parts diagram (thank you Trevor for the info.!!). I am not sure if it is for the 600 or 600D and if it is for a Carello or Siem headlight (if there is a difference). I am also not sure if it replaces the US version headlight bucket which is welded in place and part of the bodywork, or if it is an insert. As I recall, there is no part number for this on Trevor's diagram/list, which leads me to suspect that it is part of the bodywork. Not a problem for me though, as I need to replace my headlight buckets anyway as they are rusted out.
Funny, I cannot even buy something on ebay in Europe without J.S. knowing, hehe! Do you recall then, the complete headlight assemblies I bought for a Fiat 500/600 in the US? They fit nicely into the alloy headlight rings for the 600D (which I was able to get on ebay after yours sold to a higher bidder). But, I am not sure that they are the correct headlight assemblies as per Trevor's diagram. I think the ones in his diagram show the separate lenses, gasket, reflector, etc.? Are they perhaps a substitute? Or do I have the wrong parts?
If anyone out there knows of a source of used 600D parts somewhere on our planet (the correct 600D ones), please let me (and Jeff?) know. There's gotta be a boneyard for 600s somewhere in Europe. I need to get the spring clips, screws and other bits and pieces to complete the conversion. And no, I would rather not pay that "other" source reverse discount prices for something that might not even be the correct parts (or even all of them?).
Geez, what a search!! I expect to find the Holy Grail and an NOS front plastic grille insert for my 1300/124 long before all of the correct headlight parts.....
Bibito - do you know if your buckets are the early 600 ones, or later 600D ones? The buckets appear to have an opening at the back that the US ones do not have. If they are the ones I need, I am interested. If they are the earlier 600 ones, perhaps J.S.
Gil