Anderson window sash balance

A quick learner from Monmouth Jct says:
I have Anderson windows who's sash cords are broken. I opened up on of the window and got the following info from the balance body "E209#315-85". But I could not find a sash balance with this number. Can you help?
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Paul from SWISCO responded:
Thanks for posting! I think you should take a look at our 24-939 Andersen Sash Balance. This can be used to replace balance boxes with the stamp 9#31.
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