28 inch window balance

A handy person from New Jersey says:

October 5, 2020

2 left ,2 right if that matters stamped 28B B
S LH

1/2 " both sides depth 9/16 I

Bob from SWISCO responded:

October 9, 2020

This looks like an S775-28 Channel Balance to me. Look it over and let me know what you think.

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