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I run 8" and 9" D90's on my '90 C4 Targa. The 9's are a 928 part #.
The D90's on the C4 lightweight look like the standard D90 and do not have the curvature shown on your photos.
I cannot say if they do or don't, but it isnt out of the question. ATS (manufacturer of the D90s) also made Phonedials. They were contracted by Porsche to make a small batch of magnesium Phonedials exclusively for the 944.
The difference between the Mg phone dial and the supposed Mg D 90s is that the phone dials are known and documented. I used to own the journalists' car from the '87 french 944 turbo Cup, along with 6-7 sets of Mg phone dials, whereas no one has ever documented a Mg D90.
The alloy designation on these shows them to be aluminum alloy. Could be a rare set made by SM early on and when ATS made them made some changes. Never seen these myself. There are variations of the cup I's made by both speedline and SM the speedline carries the .00 suffix and the SM .01. they look the same from the front but are very different when looking at the inside.
I think that by manufacture dates and serial numbers they are early series or pre-series wheels.
I mounted the front one I have on my '89 C4, and there is minimal interference with the 993 brake calipers I have on there, nothing that a 3mm spacer won't solve. The other 16" wheels I use (forged Fuchs and Wintercults) fit without issue.
Now to find the last 6" wheel to finish the set.
Gathered some more data, right in front of my eyes. I have a few Christophorus magazines from 1988 and 1989, an the pictures were right there in my bookshelf. Several pictures of the wheels, all on factory registered cars.
And to further on Earlydays' idea, it seems that the 200 red 964 for the US distributors were not equipped with these wheels.
Your wheels were made by Stahlschmidt Maiworm, the "SM", located in Bad Durkheim, and perhaps now a part of the ATS Gruppe? You might contact them and see if they have any NOS left, or can direct you to someone who has?
I believe these wheels were first used on the 928 GT. Google on Porsche 928 GT and most photo's where you think it has D90's you will see it has these dished wheels. So maybe you search for their origin should not be with the 964?
I believe the GT wheels were forged, but maybe the first D90 wheels used this design?
Johann,
The wheels in all your pics are forged so-called Clubsport wheels. I've had several sets. They are made by Fuchs, and only have a resemblance to the subject wheels of this thread.
I'd gladly look for *my* wheels in the 944/68 and 928 lines, but the one I am missing is a 6" wide, never offered on the 928 nor the 944/68...