Thats a pretty wide wheel, the escort cosworth rims are 8 x 16 and i know that to get them on safs you have to roll the front arches, also saf wheels are ET40 from the factory and when i fitted a set of ET38 17 inch RS 7 Spokes to my 4x4 , i found that they were catching on the front brake calipers, so i had to fit 3 mm spacer plates on the fronts. I think that you will find that the rear of the car will not be a problem, you can get 18's on the back of a saf without any rubbing but the fronts will probably give you major trouble