Wheel sizes that fit '08 G35x

[Number1gsxxr]

Forgive me if this has been posted before but I did a search and didn't find what I was looking for.

What size wheels fit the 2008 G35x. I'm inquiring for my friend who is looking to get aftermarket wheels. He has the non-sport model. I know with the awd you have to keep them all the same size but what are the width and offsets that work? Is it like the previous years? Is 8.5" as wide as you can go in the front? He'd probably be looking at 18" or 19" wheels.

Or is anyone selling the '08 OEM Sport wheels?