Window channel measure

A quick learner from Allentown, Pa says:
Have 25" channel measure needs replacing. Window has 25" and 28". Top window is one broken. 25". I guess both sides needed??
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. I'm afraid I cannot identify what you have based on the stamp alone. That isn't any kind of part or identification number. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.
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