Emily from SWISCO responded:
January 13, 2023
Hey there! Based on what I see in your photos, my recommendation would be either our S351-22 or S390-22 channel balances. The crucial difference between these two parts is the depth of the bottom fitting so you'll need to measure as shown in the image below. I also recommend the 2170 strength option. A pair of balances with this stamp will support a sash weighing 34 to 37 pounds. Comparison of the S351 and S390 balance shoes.
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