anderson sash balance

A handy person from ma says:
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Tom from SWISCO responded:
I believe the key stamp is "827." Can you confirm that it is displayed differently? Perhaps it is larger, or more prominent. If so, I recommend our 24-837 Andersen sash balance.
A handy person from Anderson Sash Balance says:
There are 5 windows with broken balances. I dismantled one window to get the part number of the balance and you pointed me to the 24-837. Do I need to dismantle each window to get each part number if the windows are not all the same size? Thanks for your help.
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Tom from SWISCO responded:
Yes, I'm afraid the only way to know for sure what balance you need is to tell us what numbers are stamped on each balance.
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