27" replacement window balance

A quick learner from Davis, Ca says:
Hi, I have a non tilting window balance that needs replacing, block and tackle style,if you can help me find the replacement.I have attached pictures. the length of the metal portion is 27 inches. Printed on the metal is Caldwell 26 4 FS. both end caps have wings that are 15/16" wide. I hope this is enough .
Thank you, Ivan C.
A customer submitted photo of channel balance attachments.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting, Ivan.
This looks like SWISCO S385-27 channel balance with a 2640 stamp option. Compare the measurements of the fittings and and let us know if they differ in any way.
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