Yeah mate, still on my GT-R, They were on the car when I bought it, Don't know too much about them, not alot of info on the web that I've seen, They are pretty darn light I want to get the tyres off so i can weigh them properly, Do yours come with a little sticker on the inside of the wheel in jap ?
On another note,
People looking at these wheels the awesome offset they come with, they can naturally fill out a GT-R guard without requiring spacers !!!