Clogzz wrote:Something since too if it’s still any use, the label and socket of the stacker in my 2003 C5.

Two things
That looks exactly like the socket on the CD changer of my 607 (year 2001). I am trying to figure out why all the manufacturers of CD changer emulutors / adaptors / AUX in etc list a different part number for Peugeot to Citroen (like xcarlink, yatour etc)? When the CD changer is the same? or is it?
On the 607 the head unit to CD changer protocol changed when they went from VAN bus to CAN bus. upto 2005 was the RT2/RC2 which uses RD3 protocol. After 2005 it went CANbus and RD4 protocol. The two are not compatible, I strongly suspect the same is true of the C5.