Window balance

A handy person from Naperville, IL says:
Need to replace several window balances. I took one out and it looks similar to those on your website. The numbers I see on the part are:

E47 8 #47. 10-86


Can you tell me the part I need?

Thanks. Tom.
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Paul from SWISCO responded:
Thank you for contacting us. We are having trouble finding a match for this balance. Can I see a few pictures of the stamps in question? Specifically, I would like to see a clear picture of the stamp that reads 8#47. Thank you!
A quick learner from Naperville, IL says:
Thanks for your help. Look forward to hearing back from you. These windows were installed new in 1987.
User submitted photos of an Andersen window balance.
Profile picture of Tom
Tom from SWISCO responded:
Ah, thank you. Looks like the stamp reads 8#37, not 8#47. I recommend you look at our 24-837, which can replace Andersen balance boxes with this stamp.
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