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Casey from SWISCO responded:
October 16, 2023
Hello, The channel balance shown in your photos resembles either our S351-17, with a 15-002 bottom attachment or our S390-17, with a 15-001 bottom attachment. Since your bottom fitting is damaged, you'll need to remove an undamaged version from one of your windows to compare to the image below. You'll also need a 1620 spring strength option for your replacement balances. Thank you! 
Comparison of the S351 and S390 balance shoes.
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