Anderson balancer

A handy person from Brookfield Wisconsin says:
Width 6.25
Depth 3.0

Stamping D51 7#31 7-77

Double hung window balancer
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Donna from SWISCO responded:
Sounds like you may need SWISCO product code 24-737, Andersen Perma-Shield Narroline double-hung window sash counter balance; used to replace balance boxes with stamped numbers 7#31.
A handy person from Brookfield Wisconsin says:
Thanks. Would that be the same unit for similar vintage windows

User submitted a photo of an Andersen window balance.
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Tom from SWISCO responded:
Ah, I see. Looks like you have an older kind of balance. You may need to retrofit the new type that we sell. It would require cutting the header with a wood chisel to make room for the tab.
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