I'm currently talking to an Ebay seller about a couple of bits for my C5, he is listed as citropro and is located near Bristol Airport, says they are Citroen specialists for over twenty years and have many parts available, the car he listed for which I've enquired about parts is a 2006 C5 Exclusive. Listing has ended now but this is it.
https://www.ebay.co.uk/itm/153030907666?ul_noapp=true