These pieces connect the window to the things that hold the window up. And one is broken. Sorry that's not very descriptive! The only marking on it is the number "1".
Casey from SWISCO responded:
February 21, 2017
This might be 26-405, Pivot Bar, see if the dimensions to installation screw hole match up.
A home owner from Muncie, IN says:
February 21, 2017
Thank you, I think that's it! I just ordered one. So appreciate this service!!