The wheels you are ordering are narrow body widths, Group 4 would normaly be 10" and 13" widths.
There are some varying opinions on the backspacing, I went for the same as my GT5 which are the same as the original campi wide body wheels at 4.625" front and 4.75" rear.
There's a recent thread discussing the same question here;
http://pantera.infopop.cc/eve/...10042044/m/687101055
Julian
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