Part of window

A quick learner from Virginia says:
March 4, 2022
I do not the name of this part. It is part of the window that help to stop the sash balance. This help to open and close windows.
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Bob from SWISCO responded:
March 7, 2022

This is called a Top Sash Guide. This looks like it might be either our 18-009 or 18-166. Compare both with your old hardware and see if either could work for you. 
5/8" Top Sash Guide
5/8" Top Sash Guide
18-009
$0.99
5/8" Top Sash Guide, Kinco
5/8" Top Sash Guide, Kinco
18-166
$1.33
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