Balance Box Replacement

A contractor from Maryland says:
Window is 40" × 70" double hung need new balance box.
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Tom from SWISCO responded:

Thanks for your patience during this busy season. I can see the code "16L" printed on one of your balances, which tells me that that would be replaced by our 24-16L. This goes on the left side, while you would need the 24-16R for the right side.

Please let me know if you had any questions.

24-16R : Andersen Sash Balance, 16R
Andersen Sash Balance, 16R
24-16L : Andersen Sash Balance, 16L
Andersen Sash Balance, 16L
How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
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