A handy person from Cleveland says:
August 14, 2016
My current screens measure 20 7/8 X 59 13/16. There is no side track in the window. There is a 9/16 track at the top and a 1/8 track at the bottom. What size screens should I order?
Tom from SWISCO responded:
August 23, 2016
Thanks for your patience. In this instance, we will need a bit more information in order to help out. Specifically, we need to calculate the "screen opening" dimensions. If possible, please measure the width of the screenable area (use the single hung instructions) and the height of the screenable area measured from the bottom of that 1/8" track to the inside (or bottom) of that 9/16" screen at the top. Hopefully that makes sense! Let me know.