Safety catches

A contractor from Johnston Iowa says:
Any idea where to source these?
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Bob from SWISCO responded:

See our 26-387 Vent Latch Kit. look it over and see if you could use this as a replacement. 

26-387 : Face Mount Single Action Vent Latch Kit
Face Mount Single Action Vent Latch Kit
26-387
$16.18
VIEW >
26-434 : Double-Hung Window Opening Control Device Kit
Double-Hung Window Opening Control Device Kit
26-434
$48.45
VIEW >
How to install a Window Opening Control Device (WOCD) kit
How to install a Window Opening Control Device (WOCD) kit
VIDEO
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