I have them in my 08.5, got them from SU. PG also sells them. Note that they don't come gapped for the MS3, so you'll need that tool if you don't have one.
I run the NGK Iridium IX one step colder. They will need to be re-gapped to .028-.032. They come gapped too big. I got them at my local O'Riley's. Ordered one day, picked up the next. Lower price than any Internet source I could find.