anderson sash balance

A home owner from cedarburg WI says:
I have Anderson sash balances numbered F41 9#27 7-77.

Can you recommend a replacement? Thanks.
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Donna from SWISCO responded:
Take a look and compare it to 24-939 Andersen sash balancer. If this looks good, the 24-939 replaces balances with stamp 9#27.
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