Just tripped over the entire thread...my only suggestion more posts!
By chance were the wheels procured from a Mr Witham ?
quote="Lightweight_911"]Coincidentally during this same period I was looking for a set of original magnesium Campagnolo wheels for my '59 Giulietta Sprint &, during my internet searching, I came across an advert for a set of steel/alloy Alfa SZ wheels for a very (comparitively !) reasonable asking price.
The guy selling them was in Sicily but on further investigation these turned out to be recently fabricated wheels rather than originals ... since they comprised steel centres rivetted to aluminium rims I asked if he could get others fabricated - an affirmative response but, again, the cost was prohibitive & they were an unknown quantity being fabricated by an unknown individual ... back to the search.
Finally, by way of contact in the US, I got to hear about someone in Australia who had been repairing & fabricating Porsche 356 Carrera/550/RSK steel/alloy wheels for many years & he agreed to make a set of wheels to my specifications !
Since this was going to be an expensive venture, I wanted them to appear as correct as possible so I started to look for a suitable set of steel donor wheels (to provide the centres) with appropriate date stamps ... they had to be dated '64 or '65 since these were the only 2 years that the early 904 body style was produced ...
Unfortunately over the preceding 12 months the price of original steel wheels had increased dramatically but a 'wanted' add on the Early S Registry produced a set of (4) 65-dated wheels in very good condition at a sensible price :

- so I bought them & had them shipped directly to Australia.
I can't say that the wheel fabrication turned out to be a smooth, trouble-free transaction - there were a number of problems along the way - but I did end up with a set of 4 steel/alloy wheels.
After a lot of research (& measuring original cars) I decided to go for a set of 5 1/2's & 6's & here are a few shots of one of the wheels:


- & a comparison with a std steel wheel:


- now they just need painting so that they look like std steel wheels !!!
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