You have at least two problems. The offset of that wheel is too low, and the tire size is way too small.
Your stock wheels are +55 offset. Your proposed new wheels are 2" wider, and stick out 20mm more. I don't think that's going to work; the tire will contact the fender at full compression. Oh, but also your proposed tire size is 7.1% shorter than stock. Your speedometer would be off by that much, your gearing is going to be wonky, the car is going to sit lower to the ground by almost an inch, and it'll just look strange. You need a taller tire; the closest 255 size would be a 255/45R18.
I think you need to understand the numbers better before you try to bolt new wheels and tires to your car.
Dan
Mach V
FastWRX.com