what is this piece called in your catalog

A handy person from Lake Worth, Florida says:
March 21, 2021
It is on the top non-tilt sash.
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Bob from SWISCO responded:
March 23, 2021

This looks like a Top Sash Guide. Can you remove an undamaged one and show it to us from the front and side? I'll do my best to find a replacement from there. 
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