1/2" channel balance

A home owner from Miramar, FL says:
What is your part number for this channel balance? It is 5/8" x 9/16" and metal length is 30". Stamp is k-29-3. Photos attached.

Thanks,
Eric
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Bob from SWISCO responded:

Hey Eric. I think this might be our S377-30. Look over the dimensions and specifications and see if you agree. For a new stamp option choose 2930.

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