iPod Firewire

I just got an iPod (not one of the newer models) from a friend, and I need to buy a firewire cord to go from it to my G3. Do I get the 4 pin to 4 pin one? 6 pin to 6 pin? 4 pin to 6 pin? Anyone know?!?

6 pin to 6 pin (big plugs on both ends).