Andersen window balances

A home owner from Walpole, MA says:
I have a 25-30 year old wooden Andersen double hung window. Each glass pane measures 24 1/2 inches wide and 22 inches high. I have the old balance out and the markings on it are:

C17 6#31 3-85

Please let me know what balances I should buy from you (I need two of them). Thank you.

Profile picture of Tom
Tom from SWISCO responded:
Sure thing, Andy. Check out our 24-637. This can replace Andersen balance boxes stamped with 6#31.
A quick learner says:
Thanks Tom. I have placed the order.
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