"3" stamped window stop

A purchasing agent from Bethlehem PA says:
Hi, Please help identify, it has a number 3 stamped on it, need 10 units
Thank you

PS: on this one a little flat part is missing right about the opening.

correct size is: top across 1-1/8"
right side from top to bottom 3/4"
left side from top to bottom 1/4"
diagonal top left to bottom right 1-1/4"
User submitted a photo of a vent lock.
Profile picture of Tom
Tom from SWISCO responded:
Please see our 26-338 and let me know if this is a possible match for your stop.
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