Well I know that SLI bridges all use the same connector, but I'm not sure about the length. From experience with CF/SLI, the connectors that came with MY motherboard were around 4-5 slots long? I'm not too sure of the exact length but they were enough for two dual-slot cards to be be paired in PCIE slots 2 slots apart.
If you have the SLI bridge already, you can see if you can connect the two cards