Corners of windows as pictured

A handy person from NY says:
September 30, 2020
These have a screw in side. They are plastic and I need one right and one left.
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Tom from SWISCO responded:
October 5, 2020

This part is called a top sash guide. Yours looks like our 18-039. Look it over and let me know what you think.
5/8" Top Sash Guide, Howard
5/8" Top Sash Guide, Howard
18-039
$1.40
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