I have the ST-60 front and ST-40 rear kit with the 355x32 rotors on OEM Z4M wheels. They would not fit without spacers as the callipers were making contact with the wheel spokes. My shop tried them with a 12mm spacer set they had there and they were able to install them.
The rears could be installed without spacers but i wanted the same extra offset all around so I bought 4 12.5mm Turner Motorsport spacers and it now fits just fine. No rub either.
http://www.turnermotorsport.com/p-12...cers-pair.aspx
