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Casey from SWISCO responded:
February 22, 2021
Hello, It looks like you have either our S351-22, with a 15-002 bottom attachment, or S390-22, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need to weigh your sash to determine which option you'll need. There is a chart on the product page that explains how to choose your option based on the sash weight. Thank you! 
Comparison of the S351 and S390 balance shoes.
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Casey from SWISCO responded:
February 25, 2021
Great, it sounds like you need the S390-22 channel balance with a 2170 strength option. |
