Window Balance Replacement part - need help identifying

A home owner from Avon Connecticut says:
I'm looking to replace 4 window sash balances. Can you help me identify them? I've attached photos. The only number I can see on the part is 2400.

thank you very much.
Mark
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Bob from SWISCO responded:

Hey Mark. See if the metal channel is 20" in length. If so, this looks like our S775-20 . You'll need to select a stamp option & shoe size. A stamp code of 2020 likely corresponds to a stamp option of 20B; you'll then just need to confirm if the wedge shoe you need is 1" or 1-1/4" wide. Let me know if you have any other questions, and many thanks for your business; we appreciate it.

How to install a S775 balance
How to install a S775 balance
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