Need to identify what series balances I have

A home owner from Hudson, FL says:
Hello,
I have several defective window balances, of various sizes. They all single hung, non-tilt, sideloading block & tackle style. The particular one in the photos has a stamp reading U B 28B
Thank you
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
This looks like our Series 380 channel balance. Check it out and let me know if you agree! I would recommend our S380-28 with a stamp 2820 option.
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