The 66 and many other AC machines used a ball hitch, but the design was proprietary to AC. Ball on the tractor had a ring below it, and when hooking up, the hitch was lowered to the tractor, the ring raised up and located in one of four locations til the pin in the combine hitch would latch in place. Ball hitch was used on silage blower, baler, rake, combine. If you want to convert to a tongue hitch, unbolt the factory ball hitch and make a hitch like on a wagon. I googled AC ball hitch and collar, and got no hits, no pic.
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