Emily from SWISCO responded:
December 1, 2022
Hi there! It looks like you have either our S351-21 or S390-21 channel balance, depending on the depth of the bottom shoe. That will be the determining factor so you will need to measure as shown below. There should also be a stamp on the metal channel that will indicate what spring strength option you'll need to select. Comparison of the S351 and S390 balance shoes.
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