Conrad,
I have the same setup and GTA front wheels *will not* fit. I ended up buying a set of 18" simmons F-series instead that have probably enough clerarance for a 14-14.5" rotor which will allow me to upgrade to 6- piston brembo's in the future if I ever decided to go that route. I'm not sure about real GNX wheels, but I would doubt it. The GTA wheels weren't even close.
Hope this helps!