Replacement parts for sash

A handy person from Florida says:
Plastic piece for each side of sash Top
Thumbnail of the uploaded file named 16529600332335465923039734301227.jpg
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Lauren from SWISCO responded:

Hello, thank you for posting,

Your part resembles the 18-161 top sash guide. Please review the dimensions below to confirm a good fit!

Detail of 18-161
Detail of 18-161

Profile view of 18-161
Profile view of 18-161

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