Single sash window balance

A quick learner from Raleigh, NC says:
Please see attached photo. Identical balances on both sides of window. Stamp say SL 26 5. Need 3.
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Tom from SWISCO responded:

It's tough to make out exactly what kind of balance you have, but I think our Series 765 is a good replacement option for you. Look it over and let me know what you think.

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