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Bob from SWISCO responded:
May 18, 2021
Start by looking at either our S351-21 or S390-21 Channel Balances. The only difference between these two types of balances is the depth of the bottom nylon shoe, so compare both with your old hardware to see what matches best. See the image below. For a stamp option, choose 2030. 
Comparison of the S351 and S390 balance shoes.
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