Its worth noting that neither of those has a balljoint on the end so you would have had issues getting the center link on if one or the other was out of kilter. As well you would feel a bind in the steering OR you would see some unusual movement at either the steering box or the idler arm. when you turn the wheel.
Yeah, was concerned about getting china stuff; mobileparts said he has a USA supplier so went with him. Have to wonder given Black-Sheep's post above, if there wasn't a shimming need, but glad to say new pitman got the results. So far so good anyway..Most of the new reproduction pitman arms seem to be bent a bit different than the originals. I had the same problem as you. I ended up finding some older USA made pitman arms on Ebay, and that solved my issue.
I had the same issue but with a 73 Charger . It was definitely the idler arm bracket for me, like dwv mentioned, pretty much did the same as he recommended. If I remember correctly mine was from a curb in the early 80’s