Just to close the loop on this, the best way to get genuine Alpina parts seems to be to post here
![Big Grin](http://www.theforumapp.com/alpina/images/smilies/biggrin.gif)
You'll get lots of helpful replies that way. Thanks to everyone who helped.
In my case the part I was looking for is EUR800+ new, which is too much for me right now.
According to one person who helped me (they can identify themselves if they wish...
![Smile](http://www.theforumapp.com/alpina/images/smilies/smile.gif)
) Alpina will require you to provide:
-a VIN matching the part (i.e. from a 3.2 in this case), which I don't currently have
-evidence that you originally had this part installed and it's now damaged
If this is all true then I find it disappointing that Alpina would set out these requirements even for genuine owners who are looking to mix-and-match parts a little bit. Either way I'm not paying that price for the part so I decided not to push it. The second requirement explains the "quality" parts I see on eBay which look like they've been blown up with dynomite.