Sash balance

A handy person from Green Bay, WI says:
September 1, 2023
I need a replacement sash balance for an Anderson double hung window. There are several numbers on the old mechanism. They are: 827, 11600A-3, 11600-17 and BK 24 6 90. The window is approximately 28 by 24 inches and is double pane insulated. Can you tell me from those numbers which part number I need to order please? Thanks, Kevin.
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Emily from SWISCO responded:
September 5, 2023

Hi there, Kevin.

Thank you for contacting us. I wonder if you may need the 24-837. This is meant to replace balances that include the 827 stamp. Seeing a photo of the numbers stamped on the balance would allow us to confirm. 
Andersen Sash Balance, 823, 827, 831, 837
Andersen Sash Balance, 823, 827, 831, 837
24-837
$54.20
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