Andersen Sash Balancer

A home owner from Aurora, CO says:
Looking for a replacement for these two balancers. They are stamped with P57 12#26 9 83
Which replacement part should I order? Thanks
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Bob from SWISCO responded:

See our 24-1231. These are meant to replace Andersen balances with the stamp 12#26, or 1226. 

A home owner from Aurora, CO says:
Thank you!!
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