Should be the same as Concord and Spirit anyway, and possibly 72+ Hornet and Gremlin.
I just made one from 7/32" drill rod, a 90-degree bend at one end (washers, cotter pins) and a folded-steel clevis and pinned threaded rod coupler. I couldn't find one locally after a month of looking.
Probably you will find one in 10 minutes. They should not be rare. They'll vary with the throttle linkage setup; my 81 intake manual has the hang-low bracket.
Now that I made one, I'll probably see two every time I go to U-Pull-It.