Is there a guide or some way of finding out what wheels will fit what Porsches? I'm selling some Design 90s on Ebay and am getting questions if they will fit different cars or not. I have had two ask about 79/80 911 SCs.

 

You just say that the offsets are 52.3mm front and rear and will only fit without the need of spacers Porsches with an offset of 52.3mm. This means post 1986 model year 944s (924S as well), and 964s. Earlier model Porsches have different offsets and all require spacers to retain the same track and to avoid internal rub.
The SCs require spacers, approx 15mm on the front and 30mm on the rear. I know a couple of people who have installed them and ran 21mm spacers on the front and 37.5mm on the rear and rolled their fenders.
Ciao,
Adrian
911C4