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Good luck finding it-I tried for several days and finally gave up. The vendors have a kit with a couple of taps and dies that includes the one you need. I think it sells for about $26 which is alot less than what you'll spend trying to find a specialty die.
You can buy a 3/4 "thread chaser" from Jawco tools (do a internet search) for $4+ shipping(#7520-53). Or if you have Snap-On out there they have it in the catalog for $8 (#RD7-6) ...redvetracr
Once you have cleaned up the thread use a new nut as well.
I have found them in OZ from specialist nut&bolt suppliers in the past but they moved or went out of business.
:cheers:
James