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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