Plastic storm window part

A professional from Allentown, PA says:
I am trying to find a replacement part for a storm window. I am sending a picture of what is left of the part(one end is broken off). The only markings I see are on the back of the long side it says "R4". Please let me know if you can find this part for me!! Thanks so much!
User submitted a photo of a thumb latch.
Profile picture of Paul
Paul from SWISCO responded:
We don't have this exact latch, but we have a metal version that may work. See our 91-010 and 91-011 and let me know what you think.
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