Jasmine from SWISCO responded:
November 10, 2023
Thanks for writing in! The plastic piece you are searching for is the top sash guide. This part helps to guide the balance in window channel and prevent the balance from shooting out. Yours appears to be the 18-042 Pan Am Top Sash Guide Pair. Take a look over the dimensions and compare them to confirm that these are the right fit. Detail of 18-042
Alternate view of 18-042
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