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V6 G8 wheels have the same specs as the GT 18" wheels, 18x8", +48ET. Spoke clearance is around the same I believe.

I prefer the look of the V6 18" wheels to that of my GT 18" wheels.
 

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I've been rocking my v6 rims on my gt since April 2009. The 18" stock rims don't fit GXP cars (more specificially the brembo fronts don't clear without shims).

Should be good to go.
 
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