Looking for this part that goes on the window and acts like a stopper

A quick learner from Merced says:
April 9, 2020
Looking for this item that goes on the window side and is secured on with 2 screws. It acts like a stopper is my guess. Please let me know if you know what part number it is or what it is called. Thanks
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Tom from SWISCO responded:
April 10, 2020

Hello! This part is called a top sash guide. It installs in the top two corners of the sash and keeps the channel balance in place. Yours in particular looks just like our 18-171. I think this may be what you want. Look it over and let me know if you agree!
Stepped Sash Guide, Alpine
Stepped Sash Guide, Alpine
18-171
$1.35
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