300 x 24mm.
http://realoem.com/bmw/showparts.do?...66&hg=34&fg=07
But for the price on that website... I would go with BMW dealer bought rotors. The performance ones for my 135i listed out at 180 euros each. I bet these smaller rotors are much less.
schmiedmann.de has them for only 72 euros!
http://www.schmiedmann.de/3411685499...uktnummer.aspx