Had the car in for a major refresh and added one more thing to the list. Add a Komfort Blinker to the car. Long story short they "broke" my radio putting it back in. Sending it off to Panasonic for repairs. Got me to thinking of buying a spare just to have and to hold. Question. The part number I have is 4B0-035-195N. It has just a single CD. Does anyone know if the in dash 6 CD changer is a plug and play or would it require modification to the unit or wiring harness? Lastly was that unit the same through all the A6/A8/Allroads. Thanks in advance for any guidance.