Dust corners.

A handy person from Virginia says:
November 2, 2020
They fit on the corners of the window sashes. Tracor cat 5 hurricane windows ... slide into top retainer from the side
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Casey from SWISCO responded:
November 4, 2020

Hi there! Take a look at our 26-161 Bottom Sash Top Guide Set. Thanks for posting!
Bottom Sash Top Guide Set
Bottom Sash Top Guide Set
26-161
$3.07
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