Which series 380 balance

A handy person from Florida says:
I need 29 inch balances for two windows the same height but different widths. One pair of the old balances are stamped 28B USB and the other pair stamped 28D USB.
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Casey from SWISCO responded:

Hello,

I see that you were looking at our S380-29 , which will use our 2820 strength option for the lighter window sash and 2840 for the heavier window. Thank you!

A handy person from Florida says:
The balances were installed and the windows operate perfectly! Thanks very much for the online guidance. I have used Swisco parts several times and have been able to save myself and friends and family members the cost of window replacement. You provide a tremendous service with your parts and expertise.
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Casey from SWISCO responded:

I'm happy to hear that everything worked out for you. Please don't hesitate to reach out in the future if you need a hand with any other projects.

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