Help Identifying Replacement Channel Balances

A landlord from Austell GA says:
I do not know the maker of the windows in the house I own. I need help identifying the correct replacement channel balances. I have provided pictures. The only markings on the part are "28 4 Caldwell LM." The part measures approximately 5/8" W x 29" L.
A customer submitted photo of channel balance attachments.
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Paul from SWISCO responded:
Thank you for posting, and for the pictures! Please take a look at our S380-29 Channel balance with a 2840 stamp option and see what you think. I believe that this is our closest match to your sample.
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