Alside double hung window pivot latch

A home owner from Illinois says:
I need to replace the left and right pivot latches for a double hung window. These windows were purchased by the previous owner of our house. Where can I locate a part number the latches pictured? The latches appear to only show a patent number.
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Paul from SWISCO responded:

Looking at the offset of the bottom tooth, I believe both our 26-263 and 26-264 tilt latches are a good place to start. Take a closer look and see what you think. 

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