I have an OEM 6 disc CD changer (Panasonic 2002) for the MK4 model VW Jetta that hooks up in the trunk with the cord. If anyone is in the Pittsburgh PA area, then you can have it for free. I haven't used it in years (I no longer have the car), but it worked the last time that I used it.

If no one in my area replies for a week, then I will ship it to someone else for whatever the shipping costs.

I didn't need to program the CD changer to work with the car's computer. I plugged it in and everything worked, so don't ask me how to make it work for you. I assume no liability for whatever you want to do with it.