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At one time I had literally hundreds of these pigtails. Tossed the whole crate of them, couldn't find a purpose. Who knew. These are two way flat connectors. You might find them in the electrical section of an auto parts store, they are sometimes used for trailer connectors and such.
Just in case anyone has to do this again, these are Lucas bullet connectors that come on the fan. I plan on putting a pigtail on one side and the Lucas style butt connectors on the other. I found a supplier on Ebay here:
I removed the connection off the old fans and used crimp connectors to confirm correct polarity (fan spinning in the correct direction) then used shrink tubing.