For fitting an aftermarket HU to a '99 B5 A4
I believe there are 3 different systems fitting the car that can usually be worked out from the connector on the back of the HU....however, the left side of it will sim[ply not unclip. Am prepared to get it out forceably although only when i have all the bits to put new one in.
So....anyway of telling which system it is? I know its not bose, but unsure after that