Anderson Window balance

A quick learner from USA says:
Hello -

I am looking to replace some Anderson window balances. The numbers on my right balance are BP23 12#27 4-86

Can you tell me which balance I should order?

Thanks -
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Tom from SWISCO responded:
I sure can, Chris. I recommend our 24-1231. This can replace Andersen balances stamped with "12#27."
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