Window sash for Andersen Window

A quick learner from Vienna , -VA says:
Windows' sash need replacement. The code is R20 931 11. What replacement part should I buy? Thanks
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Tom from SWISCO responded:

Hello! Based on your old stamp of 931, I am very confident that you can use our 24-939 Andersen sash balance to replace the original.

Please let me know if you had any other questions.

A quick learner from Vienna , -VA says:
Thank you! I will order these then!
How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
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Andersen's Narroline Sash Balances
Andersen's Narroline Sash Balances
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