MFD interface

[red head]

I have a Mk4 Golf with the manufacturers double din sat nav unit, MFD version D. I also have a Dietz 1412 inteface that enables a DVD, tv tuner or MP3 to be connected to the head unit. The only problem is I don't have the lead that connects the interface to the head unit. Anybody have an idea where I can buy one of these from?
Cheers