Will these wheels fit?
 

Stock 991.2 size is 19 x 11.5, ET76
Proposed is 19 x 11, ET55

12.5 mm of the offset difference is used to compensate for the wheel width difference, therefore the wheel will be pushed out 8.5 mm more to the fenders with the new wheels. I can't see that less than 1 cm will be an issue (?).

Thanks