Replacement 29" channel balance 28 4 IU CMC 7

A quick learner from cudjoe key florida says:
Markings on the balance are as follows: 28 4 IU CMC 7. 29 inches total metal length. rolled edge. from a NuAir single hung window
A customer submitted photo of channel balance attachments.
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Tom from SWISCO responded:
Thank you for posting, and for the pictures! I believe you have an S385-29, but before I can say it definitely I would like you to take a look at the graphic below. Confirm your balance has the 15-004 attachment (which looks very similar to the 15-005 attachment).
A SWISCO guide to identifying balance shoes.
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