Andersen Window Sash Balance replacement parts

A home owner from connecticut says:
Hello, I have the following windows that need new sash balances. Can you tell me what parts I should order?

The dimensions of the windows are as follows:

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Paul from SWISCO responded:
It's very difficult to determine what balances you need based on this information alone. The only way to really be sure is to know the numbers printed on each balance box. That said, check out our 24-939 for the 36x53 window, 24-531 for the 20x49, and 24-1033 for the 40x49. Again, though, I can't be sure. I highly recommend telling me what stamps are printed on each balance.

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