Are you able to draw it up in a 3D modeling CAD program? There are websites that accept your drawing, machine the part, and mail it to you as long as you have the money to pay for it.
Alternatively, if you can find a stock class fitting with the correct threading but made by a different manufacturer, it should work. Angel threads? God, it's been so long... you'll want to double check that.
shoot the ****: irc.oftc.net #doublethink