It's a connects2 aux cable, i had it working but I was daft and plugged it into the cd changer slot as i had mine disconnected at the time. Does it not fit in that slot at all then? Have you lifted the mechanism that holds the cable block in? I know it's a silly question but in your pick you have the connector in and the black mechanism closed. Edit - sounds like you've done this now.
After the delay in it reaching you and me being a cock and putting the wrong address on the 2 items I feel bad your having problems, if you cant get it to work let me know, I'll refund you and the cable can go in the bin, it feels like its cursed lol