Emily from SWISCO responded:
May 11, 2022
Hi there! This looks like it could be either our S351-35 or S390-35 channel balance, depending on the depth of the bottom shoe. The Series 351 comes attached with a 1" deep shoe and the Series 390 comes with a 1-1/8" shoe. Take a look at the image below to see which one matches up best. You'll also need to select the 3450 spring strength option. Comparison of the S351 and S390 balance shoes.
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