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sash balance replacement

A home owner from sandwich ma says:
replacement sash balance for Anderson window no. 11600-2 stamp no d21 7lb.31 4 81
these are the markings on my sash balance. window is 1980 vintage. please inform me as to what replacement will work for me.

thanks you, Louis
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Paul from SWISCO responded:
Thanks for posting, Louis. See our 24-737. I believe "7 31" is the key stamp here, though that "lb." in the middle makes me hesitate. Look at that stamp closely. Is the "7 31" portion of the stamp printed differently? Maybe a little larger, or with a different font?
A home owner from sandwich ma says:
what shows on my sash balance is this

D21 7#31 481 printed along the bottom of the long side

on the opposite long side is printed

11600-2
User submitted a photo of an Anderson window balance.
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Paul from SWISCO responded:
Thank you, that's exactly what we needed to know. I think the 24-737 is the best match, then. This can replace all Andersen balance boxes marked with "7#31."
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