29 inches 28B channel balance

A home owner from windermere fl says:
need to replace original balances. 29 inches long and stamped 28B
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Lauren from SWISCO responded:

Hello, thank you for posting! 

With this combination of attachments, you could have either an S380 or S385 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You will need a 29" balance with a 2820 stamp option, meaning your window sash weighs between 12-16 pounds. 

Swisco.com
Please let me know if you have any questions. 
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