If the leather you bought was from an import, then they might have to airbags in them, in which case you'll have to place a resistor in the cars loom to make it think it's connected to the seat. If they 100% have airbags, and the connectors are different (never heard of this) then just chop off the connectors and solder the loom to the seat. The airbag reset won't work if it's not connected.