Hello, just got an A2 and love it. Am trying to replace the factory chorus stereo with the Alpine CDE-0104.

The Chorus has 2 black boxes, 1 red and 1 brown - not sure what each one is?

I ordered the following autoleads:
PC9404 harness - however this red box doesnt fit audi red box?
PC552 ariel adaptor
FP0504 facia adaptor

Can anyone help as I dont know where I have gone wrong and there are several audi wiring adaptors out there?

cheers