Window will not stay in the open position

A home owner from Florida says:
I recently purchased a new home. One of the windows falls every time you try and open it. I am not familiar with the terminology of window parts but I believe the part that has broken is part of the balance. From what I can tell this is screwed into the window frame and keeps the balance from shooting up. I have tried local big box stores and no one knows what this part is or how to find a replacement.
User submitted photos of a top sash guide.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. Could you use our 18-166? The dimensions are very similar, but carefully compare what we show to your own hardware and see how they match up.
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