'90's CC Head Units

[TooManyAudis at aol.com]

Does anyone know if the CC Head from a '92 on 90 is the same as a 100 / A6  
is the same as an early A4 -- with some S4's and S6's thrown in?
 
Obviously, the more cars I can choose from to fit into my '95 A6, the  better 
the pickin's.
 
Thanks,
 
tom



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