Mat rs

S2 rst. just got sum wheels, compomotives mo's 5 spokes. They are 7.5 by 17 plus the offset is et37 and im sure it should be 35 + im sure they should be 7's. Now ive got the wheels and the tyres are on they are 205/40's, and i cant be arsed sending them back. They are now on the car and they are never guna fit on the back without sum arch work, oh + the car is lowerd 40mm. i would like to know if they will fit after the arch work and its not just guna be a waste of time and money cos it looks bloody close. ive been assured by the reputable company that ive bought them off that they always sell S2's these wheels. N e body n e ideas? thanx.