@TeePee53 is spot on. Only the Insignia and Commodore VXR are 5x120. ALL other Insignia/Commodore/Regal variants are 5x115, including the Regal GS.
Thanks Jack for the info. You learn something new everyday.
For some reason I though the GS also had 20" rims. Knowing that the European market had the 5 X 120 stud pattern it also makes sense for the VXR stud pattern. I couldn't see them making that sort of change just for a market as small as ours. Then again I guess you never know what can happen.
There's plenty of confusion out there. As well as wheel-size.com, these places (obviously incorrectly) also list the VXR as 5 X 115.
AMG Australia has many alloy wheels to fit Holden Zb Commodore Vxr 4d Liftback. Come and see us in St Marys and we can find the right wheels for you
www.amgaustralia.com
Donnellans has many alloy wheels to fit Holden Zb Commodore Vxr 4d Liftback. Come and see us in Blackburn and we can find the right wheels for you
www.donnellans.com.au
Looking at the tagged info for both AMG and Donnellans it could appear they are the same ouitfit with different branding.