Andersen window balances

A contractor from Westfield, MA says:
April 8, 2019
I am in need of Anderson window balances. What was strange was that the windows were the same size, (32x49), but there were different part numbers for the balances. I need two that match the (D 41 8#31 8-85) and two that match the (BD6 8#31 9-85.) Both also had the part number 11600-17 printed on them. Thank you!
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Bob from SWISCO responded:
April 9, 2019

Thanks for writing in. In fact, you can use our 24-837 to replace both balances, as this balance box is meant to replace any Andersen Sash Balances that include the stamp code 831, or '8#31'. Still, it was wise to check all the boxes despite the windows being the same size; with Andersen balances, you can never be too certain. Let us know if you have any questions. 
Andersen Sash Balance, 823, 827, 831, 837
Andersen Sash Balance, 823, 827, 831, 837
24-837
$54.20
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