Replacement part for 38 5 FQ caldwell in picture

Thanks for posting. I am confident we can help replace this channel balance, but we need more information. Firstly, can you double-check the metal channel length (not including the fittings)? Usually the length of the metal channel is one number greater than the first two digits of the stamp; so for instance, a balance stamped 38-5 is usually 39" long. Please confirm. 

Secondly, can you send us pictures of both fittings? I need to see if they have wings, or 'side tabs'. That will help narrow down all your potential choices. Many thanks. 

Thanks for your photos. Based on what I see here, you have either our S380-39 or S385-39, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S378, S380 and S385 balance shoes.

You're welcome! Please feel free to reach out if we can be of any further assistance.