Parrot MKi9200 + 2004 Boxster, anybody know how?

[Anim]

Hi all

I have a 2004 Porsche Boxster S which has a Single DIN Becker CD stereo CDR23 with Amp and CD Changer in the front boot. It has dash and door speakers too but no rear speakers.

I want to add a Parrot MKi9200 Bluetooth kit to it (for iPhone music and hands free calling) but I believe I need some kind of wiring converter between the stereo and the amp.

I have phoned around a few places and they all get a little stumped as to which lead I need. Some say I don't have a MOST system and others say that I do and its getting confusing. I will get it professionally fitted but would like to buy the kit myself.

Does anybody know which cable I need?

Thanks
Anim

UK