Hello Alanm73,
I have an Audi to Phatbox cable that I could sell, but since I don't have an Audi, I cannot say if it is compatible or not with your head unit (it came with a brand new Audi spec box that I bought for another purpose).
The head unit connection on my cable is a 13 way DIN socket. PB end is the normal 26 way plug of course. Part number marked on the cable is CAS-001-AU-15.
Price would be 15 pounds or 25 dollars plus postage at cost if you are interested. (I am based in the UK).
Regards,
Les.
