George,
It seems to me, the items shown in the diagram are GT3 parts not GTS. The clue is the roll cage. GT3's had wheel spacers on the front, not to increase the track width, so the reinforcing ribs on the inside of the 15x8 Campi wheels would clear the GT3's big brake calipers. Without the spacers, the front wheels won't turn. I know one GT3 owner who found that out the hard way!
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