Can you tell me what channel balance I need?

A quick learner from Raleigh, NC says:
I am wondering which channel balance I need. There is the number "2830" on the side. Thank you!

User submitted photos of a window balance.
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Tom from SWISCO responded:
Please see our S371-29 channel balance. This appears to be a close match, but look over our information and let me know your thoughts.
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