I've got the Porsche 986 Tequipment brochure.
The OE wheels for
Front 8 x 18 offset 50
Rear 10 x 18 offset 47
This is the Turbo Look II as well as the SportTechno rims.
That should give u a good idea what the Porsche recommendation for 10" x 18 rears should be.
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