It came off the bottom of the double pane window panel. There is one on each side that sits in the spring loaded slide pieces. Not sure of the window brand but there is a number on the piece shown in picture. I need a left and right side piece.
Bob from SWISCO responded:
December 26, 2018
I think our 26-310 would be a good place to start. Compare the dimensions with your old parts and see if they match.