I have an original Audi 6 disk Cd Changer that sits in the dash for sale. Willing to let it go for $60 plus shipping. I got a subscription to Sirius so I no longer need it. I think it should fit any Audi possibly some VW not 100% sure. I'll post pictures for you to decide. This was taken from an A3 in case you were wondering.
This is the connector on the back. I think the cars come with the cables prewired. If not shoot me a pm and I'll check if I can take my old one out somehow.