Replacement Andersen Sash Balance D40 7#27 7-85

A home owner from New York says:
March 1, 2011
I'm trying to find out the replacement part # for sash balances from my Andersen windows. In the bottom right corner, D40 7#27 7-85 is stamped. Any help in identifying which sash balance I need would be much appreciated. Thanks.
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Donna from SWISCO responded:
March 1, 2011
Hello,
The replacement is product 24-737, Andersen Sash Balance.
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