anderson window balance #s

A handy person from Michigan says:
March 25, 2019
What do the anderson balance of 1979 and 1980 convert to?
B56 4# 19 11-80


D98 7# 27 7-79
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Paul from SWISCO responded:
March 27, 2019

For your balance with the "419" stamping, our 24-431 Andersen sash box will work. As for the balance with the "727" stamp, our 24-737  would do just fine. Look these over and let us know if we can be any further help.
Andersen Sash Balance, 419, 425, 431
Andersen Sash Balance, 419, 425, 431
24-431
$54.20
Andersen Sash Balance, 725, 727, 731, 737
Andersen Sash Balance, 725, 727, 731, 737
24-737
$54.20
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