I asked for a Media adapter from the dealer, and he sold me 84212199392. It is labelled "MEDIA" on it, the box says "MEDIA SNAP-IN ADAPTER", but it has no fan. It is dated into the dealer's stock 23/3/2012.
I have to admit to feeling a little ripped off though. I have just discovered that everything that I can do through the snap-in I can do with a plain jane white USB cable - it even shows album art.
Which begs the question - what on earth is the point of the big chunk of plastic??? I have 6NF (we can't get 6NR BMW apps here) which I assume gives the smarts to fully integrate with the phone (yes? no?) and comes with the snap-in base unit, but it appears to do it all through USB as well... it all seems a little pointless!
The only reason I can think of is that I am going to use a 64GB USB for music and it means that can stay in there.