Window Channel Balance replacement

A quick learner from Mill Creek, Washington says:
I need to replace a 26" long balance made by Caldwell with the stamp 25 3 BO stamped by the name. The window weighs 17 pounds. Can you verify for me if I need to purchase Channel Balances with your numbers S385-26 with stamp option 2530?

I understand you recommend two be purchased, one for each side.

Thank you.
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Tom from SWISCO responded:
Thanks for posting! I'm afraid I cannot verify if the S385-26 is what you have. The only thing the stamp tells us is how strong your spring is. The best way to confirm if the S385-26 is a match is to carefully compare our pictures, measurements, and information to your own hardware.
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