The plastic slides at the top of the lower one of a double hung window that you move to allow you to pull down the window to remove it snaps into the opening in the window that releases it. Both of mine have broken in the process of removing them to replace other parts. The were installed 20 years ago by a company no longer in business, and were made locally. The last order of 3 that your recently shipped to me may give a clue as to what might work, #26-376. I can send a JPG photo if you give me a way.
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Tom from SWISCO responded:
April 7, 2022
Hello! Your thumb lever appears to match our 26-154. This is designed to be work with the 26-155 interior latch, but that's no guarantee that either part is what you have. The only way to confirm is to remove the existing parts and compare them to the dimensions we show in each case. That will tell you for sure. 
Alternate image for 26-154
Profile view of 26-154
Detail of 26-155
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