Lauren from SWISCO responded:
March 18, 2024
Hello, thank you for posting, It appears you have either our Series 351, with a 15-002 bottom attachment, or Series 390, with a 15-001 bottom attachment. Take a look at the image below to measure and determine which balance you'll need. The length of the metal channel excluding the nylon attachments should measure 23" long and you will need a 2240 stamp option. Please review and let us know if you have any additional questions. Comparison of the S351 and S390 balance shoes.
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