Anderson counterbalance

A quick learner from Reisterstown Md says:
i have an Andersen sash counter balance part number
D21 7# 31 281

I cannot find any part with this number.
I need 4 replacements can you help
A quick learner from Reisterstown Md says:
Here is a picture of the sags balance needed. I cannot find the part number
User submitted a photo of an Andersen window balance.
Profile picture of Donna
Donna from SWISCO responded:
Thanks for posting! Please see SWISCO product code 24-737, Andersen Sash Balance, which can be used to replace balance boxes with the stamp 7#31.
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