top corner of window

A quick learner from orlando, fl says:
I have identified the channel as 29" Series 377 Channel Balance
S377-29

I need help identifying the top end of the window as per attached pictures
Thumbnail of the uploaded file named IMG_20200525_142239904_HDR.jpg
Thumbnail of the uploaded file named IMG_20200525_142244360.jpg
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Tom from SWISCO responded:

Sure! That top part is called a top sash guide. Yours in particular looks like a good match for our 18-042.

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