Lauren from SWISCO responded:
August 15, 2023
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 determine which balance you'll need. The length of the metal channel excluding the nylon attachments should measure 33" long and you will need a 3240 stamp option. Please review and let me know if you have any additional questions! Comparison of the S351 and S390 balance shoes.
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