Interesting question. We replacted the grabirons and other parts identical to how the car arrived here at the Durango shop. Notice the upper picture, pre-restoration. It appears that the bottom grabiron is the straight variation, not the usual one with the raised left side.
The second picture shows the same corner (as judged by the stove chimney location and brake staff), with what indeed looks like a grabiron with the raised left portion to help guide a brakeman's foot.
Why the are difference? I don't know.
Our goal was to return the car as delivered, or better of course. But we also wanted to keep the slight variations seen in this car (i.e. siding widths, etc.). So we put it back as before.
Other grabirons with the raised side were originally on the car and are there now. See the third picture.
I understand if some folks disagree, or would have done it differently. That's fine, human nature. But I'm content with how we did it.
Thanks for the discussion.