anderson window balance #s

A handy person from Michigan says:
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:

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.

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