my wheels came off grant's r33 and are 18x10 +19. sat well on his car, if a teensy bit inside the guards. you can go bigger on r34.
also, atessa only shits brix if rolling diameters are diff f/r. you can stagger, but choose tyre profiles carefully. most cant be arsed with this, which is why they say run samesame all round
pics of same offset on 33r
http://www.skylinesaustralia.com/forums/index.php?app=core&module=attach§ion=attach&attach_rel_module=post&attach_id=303399
http://www.skylinesaustralia.com/forums/index.php?app=core&module=attach§ion=attach&attach_rel_module=post&attach_id=303401