Millard window balance replacement

A quick learner from Los Angeles, CA says:
January 9, 2021
Looking for 2 like this. These are fine but need for a different window, same make and size. Thanks
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Bob from SWISCO responded:
January 12, 2021

I believe this is either a Series 380 or Series 385 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or 'heel-to-toe' measurement. The diagram below illustrates the difference. See the video below as well to further determine the balance you need.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
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