Hi Kats,
I have 3 wheels in total, I got them from someone who bought second hand performance parts from Nissan (in the rally scene) back in the 90s.
Originally there was another "wide" version also. 2 wide 2 narrow, but 1 of those had a crack and he decided to find out what a magnesium fire looked like and put 1 of the wheels on a bon fire.
Sad I know, but he had no idea what these wheels really were and had stored them for years as a curiosity more than anything else.
I got them off him for a very reasonable price and couldn't believe my luck to be honest.
Not only that, but someone else had another 1 in the town / region of Ballarat (narrow version like the photo you attached) and was willing to sell it to me cheap ($100) but I found it difficult to get out that way to collect (seller wouldn't post) and in the end he gave it to a friend to use as a hose reel! *Sigh*. Same person sold a good set to 1 of the only Z432 owners in Australia not long ago. (Think he got them for a steal!) I will try and find photos of that car.
The left over wheels was however also damaged / cracked and Alan wasn't sure how easy it could be repaired when I sent him photos. I will dig out pics again if I can.
Alan informed me the narrow wheel was likely used on 4 cylinder rally cars that competed in the Southern Cross rally (perhaps the Datsun Violet SSS rally cars?) Which came through in the period, but the wide version was definitely left over from the works rally S30z's.
I would love to use these wheels at some point, but not sure what to do about the odd pairing. Worst case scenario they will become garage ornaments, perhaps my Ikeda Bussan seats with look good next to them on display? (Currently out of the car for now)...The S30z enthusiasts will know what they represent.
Reproductions can never match the originals.