Replacement part

A home owner from Florida says:
Looking for a replacement for this small piece. One is missing from my window causing it to not stay open. I can not find a window brand or replacement part numbers and not sure what this item is called.
Thumbnail of the uploaded file named A3DAEFB5-2AB7-4F99-92D1-4A9084A989BB.jpeg
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Lauren from SWISCO responded:

Hello, thank you for posting! 

Please start by reviewing the style and dimensions of the 18-161 top sash guide to see how it compares to your original. 

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