OK....mine is open at both ends and the arm itself is very curvey, there is no stud that's part of it like on a manual pitman arm.
But what I wonder about is how could this part ever go bad or get worn enough to have to replace?
I would think it would be what the pitman arm mounts too on either end.
Roger, Kanter doesn't have the pitman arm for PS on the 66 Fairlane but I found a rebuilt one at Chockostang for $50! I talked to Dan there and all he does is rebuild or collect new old Ford steering and brake parts.
By the looks of it, when it moves you can see the pitman arm move side to side a bit which I'm guessing now is the splines are getting loose. It's not easy to tell which part or parts move first but I'm starting with the pitarm sence it's cheaper then a steering box...LOL!