I have an 02 A6 C5 does any one know how i find out what radio i have as in is it a standard unit a 1/2 amplified or fully amped it is a Audi Symphony on the rear it has ariel , electric arial wire , and 3 ,I S O type plugs that look like power at the bottom , part of the speakers and the top one i would say has the other speaker wires plus extra wires , i want to fit a Parrot hands free system but finding the right S O T lead is becoming a pain in the rear end