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Casey from SWISCO responded:
June 2, 2021
Hello, It looks like you have either our S351-17, with a 15-002 bottom attachment, or S390-17, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. In the case of the balances from one window having different stamp codes, I recommend weighing the window sash and following the chart under the balance product description to choose the correct strength option. Thank you! 
Comparison of the S351 and S390 balance shoes.
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