[Boog]

I suggest measuring the outside diameter of the splines on the input shaft of the sector to get the diameter. I went from a ‘71 power sector to a later ‘75 to ‘85 power sector and had to swap the coupler. Got it from O’Reillys. I don’t remember the parts numbers or the diameter. You can buy the coupler rebuild kit for yours, that would be cheapest and most likely one fits both applications. Or you can buy both rag joints then take the one you don’t need back for a refund.