The Metra kit part number is 99-9105 and it is for 2000-2001 A4's and 2000-2002 S4's with the Sumphony II radio.

I bought mine from Installer.com but AudoOutfitter.com also had it.

It's a perfect fit, other Metra kits for the A4 are not a perfect kit.

Here is the link to Installer.com

http://www.installer-data.com/item/d...php?it=99-9105