Frank,
As you probably know, Drawbar AH508R and Support AH507R were used from serial numbers H1000-H7185. Then, still in the 1939 model year, the parts changed to Drawbar H675R and Support AH772R starting with serial number H7186. AH508R had only one front pivot hole (you couldn't adjust fore and aft position with that one), and it had two stamped "finger" clips welded to it, one each on top and bottom, that allowed the drawbar to sort of pinch the cross bar of the support bracket. The later drawbar didn't have the clips welded on, and also had two holes near the front to allow fore and aft length adjustments. AH507R support had only a single bottom crossmember, while AH772R had the bottom crossmember as well as an rear end crossmember. AH772R also had some exterior gusset reinforcement patches welded to the sides. Oh, yeah, there is at least one more drawbar -- H1030R, that started at serial number H47795. I don't know exactly what is different about that final drawbar, except I think it had an extra hole about 4 or 5 inches ahead of the normal drawbar pin hole.To answer your question, I believe if you have PTO it would be correct to have the later drawbar and support. If you want, in a few days I could scan some parts illustrations and email them to you.
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