'97 A4 Quattro 2.8L

[SEMPERFIVJ@aol.com]

My wife bought her Audi minus the factory CD changer (she loves this car like
no other she's ever seen!)  We'd like to install a trunk mounted CD changer
now (one that is operated through the factory installed stereo head-unit... no
aftermarket RF changer!)  I believe that the head-unit is an ALPINE OEM
component.  I've been beating up this problem for months... the dealer wants
outrageous money to sell me the factory CD changer kit.  Can I buy one used or
aftermarket?  I can't install a typical aftermarket Alpine CD changer... it
won't interface with the stereo and nobody has made a "knockoff" adapter that
I can find.  Please help!