28 3 CN CALDWELL

Hello there!

Thank you for reaching out to us. We may be able to help with this. Before I make my recommendation, can you show us a photo of the inside of the metal channel where the innerspring connects to the pulley mechanism? 

Perfect, thank you! Based on what I see here, you can use the S380-29 or S385-29 channel balance depending on the depth of the bottom fitting. You'll have to measure as shown below to determine the best match. I also recommend the 2830 stamp option for your replacements.

Comparison of the S380 and S385 balance shoes.

It does appear that your shoe measures over 1", so it is likely you have the S385-29. Although, it would be best to double check this before making your purchase. It is a bit difficult to confirm the measurement using photos.