Hi, I have a 2002 Audi A3 (8L) with an audi concert stereo and rear amplified sound system (1/2 bose with sub woofer in the boot). I would like to install an Alpine CDE-133BT aftermarket stereo with one set of RCA pre-outs. Would anyone be able to tell me which combination of adaptors I need to complete the job so I can get started...i have had the HU for a week already! I dont really have any intention of upgrading the rest of the soundsystem, possibly the front speakers. I have attached some pictures of the existing unit, and one of the one i wish to install.

So far I am not sure whether I should use...

The PC9-401/PC9-404 or the CT51-AU01 (What is the difference between the first two and the active system adaptor)?
The CT27AA05 or the PC5-90?
I am confident I know which facia adaptor I need.

Any advice you could provide would be greatly appreciated,
thanks,
M.