Window Channel Balance

A quick learner from San Francisco says:
I need help identifying these Channel Balances.
Photos attached.
they are 1/2 inch width

33 inches long.

User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. Before I can confirm what Series channel balance you have, I'll have to figure out what your bottom shoe is. Please look at the measurements for our 15-001 and 15-002 bottom shoes and note their depths. As you can see, they are 1-1/8" deep and 1" deep, respectively. Which measurement more closely resembles your own shoe?
A quick learner from san francisco says:
these are 1-1/8 deep
Profile picture of Tom
Tom from SWISCO responded:
Thank you! In that case, please see our S390-33 and see if it matches your existing hardware. Let me know what you think!
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