storm window latch

A distributor from Burlington, IA says:
There might be a number 4 on the back side
User submitted a photo of a storm window latch.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Thanks for posting. We would actually like to see a photo of the face of this latch. I would also need your measurements. However to get started take a look at our 91-026 and 91-027, 91-158 and finally our 91-159 and 91-183. Compare your dimensions with these parts and see what you think.
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