Upgrade S4 B5 (2000) from Concert to Concert II??

[hamishmcfadyen]

Hi guys - I want to upgrade the Concert I (ie. tape-deck & has bose) headunit on my S4 Avant B5 (2000) for a Concert II (ie. single cd & bose). Then I will ditch the CD changer, and replace with a PhatNoise. I thought about Symphony, but seems a lot of hastle to upgrade to double-din. I've found out there are several different versions of the Concert II, and so don't know which model number I need to fit correctly into my car?? I saw in the link below some hint at the bottom that I need an A6 or TT one, but they seem also to have varied over the years.

http://www.audiworld.com/tech/elec86.shtml

Anyone know what the part-number for the headunit I need is?? Any problems with this upgrade? Anyone got one for sale!?

Thanks in advance for the help!!