Andersen Sash Balance Help

A quick learner from New jersey says:
September 23, 2021
What is the replacement part number .Anderson Windows are about 30-35 years old


See 11600 on one side other side says E29 9#31 8 85
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Bob from SWISCO responded:
September 29, 2021

See our 24-939 Andersen Balance. This is meant to replace Andersen balances that contain the stamp code 9#31, or 931. 
Andersen Sash Balance, 927, 931, 937, 939
Andersen Sash Balance, 927, 931, 937, 939
24-939
$54.20
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