Window track part that hooks to balance spring

A quick learner from Apex,NC says:
February 21, 2020
I assume this is called a shoe. It's from the track of wooden double hung window. House is.20 years old. I can't find any identifiers. Thanks
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Bob from SWISCO responded:
February 24, 2020

Take a look at our 15-104 Caradco Friction Shoe. Look it over and let me know if you think this is what you need.
Caradco Friction Shoe
Caradco Friction Shoe
15-104
$1.95
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