Sash balancers for Anderson windows

A home owner from St. Louis, mo says:
Hi I need 4 sach balancers for Anderson windows. These are numbers stamped on the balancer.

BP 12#31 6-85

Please advise what I need to order.

Thank you.
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Mike from SWISCO responded:
Welcome to SWISCO! For a balance marked 12#31, you'll want to purchase our 24-1231 Andersen replacement balance.
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