Forgive me if this has already been discussed - I Searched and came up empty handed:

what wheels are the ones on the concept vehicle and where can I get some? :) I think I once saw a video of an Australian car driving around with a black version of these..

http://carsmedia.ign.com/cars/image/article/764/764282/pontiac-g8-20070213032732198_640w.jpg

Those are, IIRC, HSV rims sourced directly from Australia's HSV cars.

Expect to pay a pretty penny for them until they (hopefully) appear on the G8 GXP.

The GXP is 19" wheels, while the concept was 20s, so they appear slightly different with the extra inch overall radius.