I have been searching and reading for days trying to figure out my specific wheel tire challenge, and have not found the answer. I see lots of vague info, and some misinformation out there. If anyone has specific experience with this exact setup I am trying to accomplish, please chime in!

My car is a 99 Narrow Body. I purchased a set of Carrera IV rims(lobster forks), from a 2009 997.

The factory twists on my car are:
7.5" ET50 Front
10" ET65 Rear

The Carrera IV's are:
8" ET57 Front
10.5" ET60 Rear

I am concerned about the fitment of the wheels/tires and the clearance, especially on the rear. The Carrera IV's are 10.5 ET60, which results in 11mm increase(I believe this is the case per http://www.1010tires.com/Tools/Wheel-Offset-Calculator#) in the wheel moved towards the outside. I have 265/35 18's on the stock wheels. It looks like there is little room between the fender and the tire as it sits stock.

I do not want to roll my fenders. My suspension is stock. I understand the 2002 and up have factory rolled fenders, which of course allows for wider wheels/tires/offsets.

I would like to go with a bit wider rear tire, but I am hoping not to buy tires and find out they wont work.... I am actually concerned that the stock 265/35 might not work....

Does anyone out there have this specific setup and can offer some guidance from known fact, because you have already done it?

I think for the front I can use 5mm spacers to help with the 13mm that the IV's will have to the inside inset and 1mm from the outside of the wheel to the inset.

I appreciate your help!