I believe I have a Pella window. This part has a number one it. This is the part that keeps the window up when you open it. It is on the side of the window.
Bob from SWISCO responded:
December 18, 2019
Thanks for posting. I am afraid Pella has discontinued this pivot bar. However, our 26-406B has been made as a replacement. Take a look and let us know if this could work for you.