Sash balancer for double hung window

A quick learner from NH says:
June 15, 2022
Need 11600-2 sash balancer.
D1 8#31 12 79
Not sure which one to get. Can you please help?
Thank you
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Casey from SWISCO responded:
June 20, 2022

Hello,

The 8#31 stamp on your original balance indicates that you'll need the 24-837 Andersen sash balance. Take a look and thanks for posting! 
Andersen Sash Balance, 823, 827, 831, 837
Andersen Sash Balance, 823, 827, 831, 837
24-837
$54.20
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