OK thank you. The reason for my question was that I bought an ASUS P6T motherboard and it shipped with the SLI and what looked like a Crossfire bridge connector, but when I tried to use it the pins on the Video Card were too big. I take it the bridge was for the SLI. Wierd they woudl ship with SLI but not Crossfire given the board supports both.
Because a crossfire bridge normally comes with the card but an SLi bridge (especially if it's a solid one) needs to be able to span the PCIe slots and has always been shipped with the motherboard in my experience.