Sash balance replacement

A contractor from Massachusetts says:
Hi, I'm looking for the correct part number to replace this balance.
D27 8#31 11 84

Also there's a number
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Casey from SWISCO responded:

Thank you for your submission. Our 24-837 Andersen sash balance will replace yours marked with "8#31." Take a look and let us know if any other questions come up. 

How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
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