Window Sash Vent Stops

A handy person from Watertown MA says:
Hi, needing to locate extra window sash vent stops, or ideally maybe there are plugs that would do a better job of preventing air flow/leaks?
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Bob from SWISCO responded:

See our 26-338. Look it over, compare the dimensions, and let me know if you think this could work as a replacement. 

How to Replace a Window Vent Latch
How to Replace a Window Vent Latch
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