Need replacement latches

A contractor from Pennsylvania says:
There are no identifying part numbers on the unit. It does have a US patent number 4,674,777 Renters keep busting off the top part of the arm.
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Tom from SWISCO responded:

Your lock is very similar in design to our 38-036. Check this part out and let me know what you think.

Anatomy of a casement window
Anatomy of a casement window
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