Citroen C5 2002 install help

Anyone have any information, or pointers to information on installation of a Mk2a into a C5? I have found aftermarket faceplates, but im interested in the stalk control and if the existing headunit has seperate amplification (some hope).

But surely you will have to fit an extra battery unless you want to pedal everywhere

Never thought those C5 things would catch on but i supose on with an empeg would be kind of cool.

Supose clive would approve

But surely you will have to fit an extra battery unless you want to pedal everywhere

ROFL

Ok, now that I've stopped laughing at the Sinclair joke.......

I've found this, does anyone have any experience of these things?
http://www.incardiscount.co.uk/acatalog/CITROEN_ELECTRONIC_STALK___DISPLAY_ADAPTERS.html