A friend of mine tried to fit the Alpina rear diffuser on his M Sport and it did not work.
I have the 09 750i just before the M Sport came out so I ordered the Alpina front spoiler and rear diffuser from a dealer I found on line that has great discounts. I paid $819 front spoiler delivered and $152 for the rear diffuser delivered.
http://www.bmwpartscenter.net/partlo...?siteid=215996
The front spoiler goes on tomorrow. The rear diffuser is being delivered next week. I am trying to find the exhaust tips for the Alpina if this ebay user can get them that would be great.