Search is your friend ...................
enter the following to Google "the370z.com airbag light aftermarket seats"
and Google will take you here:
DIY: [How-To:] Racing Seat airbag light fix
Then you will see how to fix your problem ...
If you wish to "Reuse" the Nissan plug, then find a wrecker and get the plugs from seats out of a wrecked car ..... or purchase plugs from Nissan (won't be cheap though)