I think you must mean 275/30/19 on the rear .
Tire sizes are ok .
If you take the Front wheel off , youll see marks on the inside telling you offset and width (some porsche wheels have this info next to valve stem) and we can work out from there If you can physically move the wheel out with a small spacer , say 5mm .
The problem is the wheel then hitting the wheel arch bodywork .
Another alternative is to loosen the plastic fender-liner and push it in towards the car before re- tightening to give yourself a bit more play .
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