Middle and upper pane / frame bracket replacement

A quick learner from Sarasota, FL says:
Windows are 50 year old Stanley type. Bracket is from left side.
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Paul from SWISCO responded:

We can't be a 100% certain, but we believe your original part may have come off of a Stanley awning window. Is there any way you can confirm that for us? In the meantime, have a look at our 36-018C vent latch. Look over our measurements carefully and see if they match up with yours. 

36-018C : Stanley Intermediate Vent Latch Pair
Stanley Intermediate Vent Latch Pair
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