Why would you want to increase the positive offset? That would move the wheels further towards the centre of the car.
I presume you want to reduce the positive offset, meaning giving the car a wider stance??
If so, the widebody GT4 can fit +15 easily in the rear, but the front you can only go to around +25 or else it sticks out of the car.
This is presuming a ~7" wide wheel. If you go wider, you'll have to recalc your offset again.
EDIT: Hmm, on re-reading, are you looking for a generic 5x100 wheel that you can keep as a spare? If so, then any Subaru/Camry 15" wheel will physically fit. 14" does not fit over the brakes on the Aus Spec car.
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