It is the plastic piece at the top of the sliding part of the window

A handy person from Orlando, Florida says:
I don't know the brand of the windows in my condo, but I know they are from the early 1980's. I believe this part holds the window balance in place?
Thumbnail of the uploaded file named IMG_1752.jpeg
Thumbnail of the uploaded file named IMG_1753.jpeg
Thumbnail of the uploaded file named IMG_1754.jpeg
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Bob from SWISCO responded:

Hello there. This looks like the 18-164 Pan Am Top Sash Guide to me. Please compare and let me know if you agree.

Dimensions for 18-164
Dimensions for 18-164
Alternate view of 18-164
Alternate view of 18-164

A handy person from Orlando, Florida says:
That one looks similar, but as far as I can tell the one that is on my window is directional. Each side has its own unique piece.
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Bob from SWISCO responded:

Thanks for clarifying! I see what you mean now. Reviewing your photos a second time, I think our 18-042 might be a better option. Take a look at this instead and let me know your thoughts.

Detail of 18-042
Detail of 18-042

Alternate view of 18-042
Alternate view of 18-042

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