I would check to see if the factory part was actually superceded. Check with your local dealership or http://www.infinitipartsusa.com
(call them) - to make sure you can't get the actual resistor that you need. If the factory changed the part, they will have a way to retrofit the connector.
If you're good with a soldering iron here's a thread on repairing your old fan control amp. how-to-fix-your-fan-control-amplifier-t433421-90.html