thought i would give this ago
eBay - The UK's Online Marketplace
as its cheap. (your also need a RCA to 3.5mm lead) i had one laying around so didn't cost anything.
if you replace it for your blue connector the HU doesn't see the CD changer anymore
to get around this problem swap the pin from the RCA for the standard pin. (can be a pain to get the old pins out)
works perfect this was, its a straight swap colour for colour (white, black, red)
HU reads CD 1 TR1
hope this helps anyone thats wanting a cheap way of connecting there MP3 player/IPOD to the standard HU
i will upload some photos.