selecting right coil hardware

A quick learner from NJ says:
Need assistance in selecting appropriate hardware.
Repairing Durette window(defunct)
Shoe bears the following Id. :550CSB.
Measures: 1 1\4" wide x 1 1\2" long x 1\2" thick.
Please advise.
Your help will be greatly appreciated

User submitted photos of a coil balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! I think you might want to look at our 15-177 Coil Balance Shoe. This looks very similar to what you have. I also recommend that you consider our Series 152 spring. Let me know what you think!
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