27 inch Channel Balance

A handy person from White Plains, NY says:
Please confirm the replacement part number for the attached channel balance. FYI, the number "2640" is stamped into the channel. I need 4 channel balances.
Thanks, John
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. Please take a look at our S390-27 channel balance with a 2640 stamp. Compare the measurements to see if this can work as a replacement.
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