28 3 DN CALDWELL channel balance replacement

A handy person from Florida says:
I need to replace the channel balances on a pair of windows but need help identifying the replacement part. Balance has 28 3 DN CALDWELL printed on the back and the channel is 29 inches long. Can you help?
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Mike from SWISCO responded:
You have a 2830 balance. Can you please submit photos of the balance attachments? We will need this information to determine the balance series.
A handy person from Florida says:
Attached find photos of the shoe attachments as requested in your discussion forum.
User photo of their channel balance attachments.
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Mike from SWISCO responded:
It appears you have the S390-29 with a stamp option of 2830.
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