steve g'day,nice car/s
As for you tyres size it depends on your height you want but as a general idea,you will get 205s under the gaurds with out any dramas,Ive had 225s,on the rears with abit of work on my old rally pack,the car was fairly low.My mk2 RS currently has 195/55/15s and has yoky ao32r tyres.And sits nicely,maybe a bit low for the street,I will find out soon..