I ended up buying one from an Ebay seller. It was supposed to be for an Amiga hard drive. Should be able to find him here http://myworld.ebay.co.uk/amigakit_dot_com
. They can make them any length you require apparently.
EDIT: after re-reading your post it seems you want the part that gets soldered onto a pcb that has the pins sticking out. Sorry mate, don't know where to get those.