These parts are aluminum, not sure of the weight of the windows but they are pretty heavy. Need four pieces asap
Paul from SWISCO responded:
September 20, 2018
The width and height of the top sash guide are the critical dimensions. Start with our 18-012 or 18-013. The 18-012 is 5/8" wide and the depth is 19/32" while the 18-013 is 3/4" wide and 19/32" deep. See what you think.