Hej Bjarne,
I'm not sure I will be able to find you the model number, as the one I'm using came with our G-Tech external hard drive:
http://store.apple.com/dk/product/TX118ZM/A?fnode=MTY1NDA0Nw&s=alpha
That is to say, it's NOT an apple-produced cable, though it is a standard FireWire 400...