Need help finding this replacement

A handy person from Miami, Florida says:
This part is screwed on to the inside of the window. There is 2 holes on this part. The size is 5/8"

The channel balance is 16"

Thank you for your help!
Thumbnail of the uploaded file named window sash.jpg
Thumbnail of the uploaded file named window sash 2.jpg
Thumbnail of the uploaded file named sash guide 3.jpg
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Bob from SWISCO responded:

This reminds me of our 18-179 Top Sash Guide. Look it over and see what you think.

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