29" Channel balance with stamp 28 3 B H

A quick learner from Missouri says:
My balance is stamped 28 3 B H. It is 29 inches long. Which replacement would I need?
A customer submitted photo of window balance attachments and stamp.
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Tom from SWISCO responded:
Thanks for posting.

To start, please refer to this chart and tell us which bottom attachment you have.
A SWISCO guide to identifying balance shoes.
A quick learner from Missouri says:
No wings 1 1/8 "
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Tom from SWISCO responded:
Please take a look at our S390-29 Channel Balance, with a 2830 option.
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