On BMWUSA.com you can only select M4 Convertible or M6 for parts. I thought that's kinda weird. Unless I'm doing it wrong of course.
Anyways though, here's the link with pics and prices:
http://www.shopbmwusa.com/PERFORMANC...MIC-COMPONENTS
EDIT: Just noticed that even though the parts say they're for the M4 Convertible, they look like they're just regular 4 Series parts.. Ugghh!