Replacement Balance stamped 2840

A home owner from Jacksonville, FL says:
Hello, I am looking for replacement balances for older aluminum non tilt windows. Please see attached photos. The identification stamped says B.S.I. AA 2840. The channel depth is 5/8 and the width is 9/16. I will also need some with a number of 2820 and 2830. Thank you!!!
Tony
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Tom from SWISCO responded:

Hey, Tony. If you have the 1" shoe shown below, choose S351-29 balances. 2820, 2830, and 2840 are all offered as options for that balance.

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