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Emily from SWISCO responded:
October 6, 2022
Hello there! It appears you have either our S351-25 or S390-25 channel balance, depending on the depth of the bottom shoe. Our Series 351 has a 1" deep shoe, while the Series 390 has a 1-1/8" deep shoe so you'll need to measure as shown below to see which one matches best. You will also need to select the 2430 spring strength option.
![]() Comparison of the S351 and S390 balance shoes.
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