Anderson double hung window sash balance

A quick learner from Jane Lew, WV says:
32" W X 46" H

Are these sold separately or in sets?

This window is 26 years old
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Tom from SWISCO responded:
All of our Andersen sash balances are sold individually. Is there any way you can tell me the numbers printed on the balance box itself? That is the most reliable way of determining the proper match. We would need to know what each stamp reads. Otherwise, we will need to know the height and width of the visible glass for the sash in question.
A quick learner says:
I haven't torn the window down and will need to do so to find number
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Paul from SWISCO responded:
Based on your information so far, it sounds like you might have a 34310 Andersen Narrowline window. This has been known to use our 24-1033 balance, but like Tom said the only way to be 100% sure is to know the stamps printed on the balance box itself. I know it's a bit of a hassle, but that is how Andersen designed these windows.
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