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Casey from SWISCO responded:
November 3, 2021
Hello, It looks like you have either our S351-29 , with a 15-002 bottom attachment, or S390-29 , 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 2830 spring strength option for your replacement balances. As for your top sash guide, we do not carry an exact replacement but take a look and compare the dimensions of the 18-061 and 18-066 to see if either option might work for your application. Thank you! ![]() Comparison of the S351 and S390 balance shoes.
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