anderson sash balance

A contractor from pittsburgh says:
Hello I am looking to purchase 40 anderson sash balances but mine are stamped with 1231 on one side and BB on the other but cant seem to find a match any where. Please let me know if you carry this one or what model would work for me thank you so much.
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Tom from SWISCO responded:
I recommend our 24-1231. This can replace Andersen balances stamped with 1231.
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