Windows were purchased from Stevenson millworker in Ct. They are no longer in business. Part is 2-1/2 inch long 5/16 wide with hole 1" from the end . The broken cast piece goes in the top window and the other bar goes in the bottom window.
Paul from SWISCO responded:
October 6, 2016
Thanks for posting. See our 26-412 and 26-040, these appear to match the parts in your picture. I would just recommend carefully going over our dimensions to confirm these match.