Anderson window sash balance ID

A home owner from Vashon, WA says:
The stamping on this one of my Anderson (Narrowline?) window sash balances reads: E59 9#27 5 78. Do I understand right that this is your part no. 24-939? If so, before ordering several of these do I need to check each window that I'm replacing these on, or do they vary by the height of the window?

Thanks for your help. I'll probably order a couple for this window, see how it goes and then launch into the 7 or 8 more that need it.

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Tom from SWISCO responded:
Yep, Andersen balances marked with "9#27" are replaced by our 24-939. If the other windows in your house are not identical, then it may be a good idea to check them, just in case.
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