Balance String Shoe?

A handy person from Cherry hill says:
This part is attached to a string on either side of the top window sash. It looks like they hold the string to the window and have broken off.
User submitted photos of window hardware.
Profile picture of Paul
Paul from SWISCO responded:
This resembles our 15-159. Look it over and see if you can use this as a match.
Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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