A mate of mine want to fit his new Citreon C4 with his Sony MP3 head unit (I
forget the model, but its about 12 months old).
From what research I've done, their do not appear to be many (any?)
stalk/wheel adaptors for using aftermarket head units in the C4.

I have a frd fiesta from 1995 and the wiring plugs are completely
different to my new kenwood cd player, and i would like to connect it.
I know that i can disconect the speaker part easily with no problems
but i am not sure how to tell which colour is what on the other one.