Looking for a 440 flat crank pully

Like the title says.....I bought a TCI Rattler balancer, and now need a flat pully.The balancer has a 2 1/4 inch snout....and a mopar 6 bolt pattern.My buddy got a 5 inch underdriven one, but dosent know where it came from.....so even if you know where they are available, that would be a big help too!! Thanks.
Andrew/Kidd