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As said, if you're using existing seatbelts with pretensioners, those loose wires should be joined to the grey connector, and just a resistor in the black one.
The loose wires will be 2 for pretensioner, 2 for seat position sensor (in the rail), and 2 for Seatbelt warning beeper.
There should be a similar grey connector on the passenger side, however with just two wires in it, going to the pretensioner.