M-force e92 M3 spoiler
http://www.e90post.com/forums/showthread.php?t=100096
OEM e92 M3 spoiler
http://www.e90post.com/forums/showthread.php?t=108056
I'd recommend the OEM one from Tischer, you can't beat the price for their quality and customer service, shoot Evan or Jason a pm and they will take care of you. Just my .2
EDIT-- to make it easier for you, here is the link to their website...
http://www.mileoneparts.com/partloca...catalogid=4462