Pitman arms between PS and manual steering are not interchangeable. There is no way you could mix them up but it does look like something is fishy there.
Correction: What I meant to say was idler mount to frame looks the same. Idler arm to center link looks different.I see there are idler arms and center links listed as 13/16” and 7/8”.
My idler arm doesn’t look like the AC Delco replacement I found online. The mount looks flat. Mine angles down and is bent up at the end. Is it possible I have the wrong idler arm for center link?