Agreed, that arm isn't fully seated. I've done an arm install before, and it's a pain, but that doesn't look right.Hard to tell but with my old eyes, splines are not fully engaged into arm , so one of the parts the dimensions are off.
Does Redhead box have bigger output shaft box in box ?
If stock size shaft, then Qc at Fiat could be FUBAR.
Where did pitman arm come from?