I don't see as you have many choices. Either pull a factory arm or try one of the other arms, I would buy both (since they are cheap) and send the one that fits the worst back.
Ok, got a new stock pitman arm, much shorter than what I had, the tierod end fits in the taper much better, it is not bored as deep. With stock length arm, geometry is better, track bar and drag link are now more parallel.
Also put in a new used Durrango gear box and rebuilt pump for steering.