Thank you! I went to two stereo shops today and they both told me that they don't stock stuff like that. They said I'd have to go to a VW dealer... I'll try again tomorrow, but if you could find a part number it'd help a lot.

I also emailed support the day I posted this thread but did not get any reply. I leave for my trip next Friday so I'm hoping I'm able to get something figured out by then so I can get this installed in time.