And here's one right back at ya buddy.
Early model 350Z Track runs on EXACTLY the same sized rims front and back, like I mentioned before. They are 18x8+30 all round. However they ran different sized tyres. This is what they look like.
It was not until 2005 when they released the Anniversary edition 350Z Track that had staggered rims. And they were 18x8+30 fronts, 18x8.5+33 rears. Subsequent models ran on the same Anniversary rims. Here's what they look like.
And you are arguing with someone who not only sells rims as a business, but even owned a 350Z 2003 track model, with the very same rims as the first picture.
And just another point you mentioned about the 17" rims being the same sized F & R? Well they are not..
You may have most likely researched your findings through an American site. And to be frank, I don't blame you because their 350Z versions and how they interpret Touring/Track/Anniversary cars are completely different to our Oz models. And that's a fact.
So enough with arguing, let's just move on shall we?