Identify channel part

A home owner from California says:
Hello, will you telL me what part I need to purchase? The channel is 22" in length.
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Casey from SWISCO responded:

Hello,

It looks like you have either our S351-22 , with a 15-002 bottom attachment, or S390-22 , with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a 2130 spring strength option for your replacement balances. Thank you!



Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
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