sash balance

A contractor from NJ says:
I am looking for anderson sash balances, but cannot match the stamped numbers to the ones on your website. There are 10 stamped BL6 10#31 10-84, and 2 stamped D97 8#31 2-84. On the other side, they all have the number 11600-17. These are all the string/spring type balances intalled in the head jam.
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Bob from SWISCO responded:

For the Andersen balances with the stamp 10#31, or 1031, see our 24-1033 . For the balances stamped 8#31, or 831, see the 24-837 .

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