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Casey from SWISCO responded:
February 19, 2021
Hello, It looks like you have either our S351-27, with a 15-002 bottom attachment, or S390-27, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a 2640 spring strength option for your replacement balances. Thank you! 
Comparison of the S351 and S390 balance shoes.
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Tom from SWISCO responded:
February 25, 2021
Sure thing! Based on your old stamp of 26-4, you want a 2640 stamp option. |
