Jordan Window balances

A home owner from Oklahoma city says:
29" long, 1/2" channel, markings "2840 BSI tj"

need six of them
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
It's hard to tell what you have, but start with our S390-29 channel balance. Carefully compare our information to yours to confirm that it's the same.
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