D57 7#27 11-77 balance

A handy person from Lanesville Indiana says:
Hi I have a D57 7#27 11-77 . I have to replace these quickly for a house sale,HELP!!!
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Tom from SWISCO responded:
Thanks for posting! Please go to 24-737 Andersen Sash Balance. This can replace balance boxes with the stamp 7#27.
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