Double Hung Window 53x35 Plastic Piece

A home owner from Fredericksburg Virginia says:
Good Evening,

I am looking to identify the pictured plastic items for my 53x35 double hung windows. One side is whole and the other is snapped. I can not identify what these parts are called in order to replace.
Thumbnail of the uploaded file named B3316E59-F0F9-4FD8-8FC2-2AD54E55087D.jpeg
Thumbnail of the uploaded file named 12FD5DE1-30AB-43B7-98C2-28671F0F832B.jpeg
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Tom from SWISCO responded:

I'm afraid that I don't recognize this part either. I'm reminded of our 16-031 mounting bracket, but yours still looks very different. Could this be what you're looking for? Look it over and let me know what you think.

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