Replacement Channel Balance

A home owner from California says:
Attached are pictures of my channel balance. Need to know which one I will need before I order. Length is 27 inch measurement. The rest is on pictures provided.

Thank you!
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Casey from SWISCO responded:

Hello,

It looks like you have either our S351-27, with a 15-002 bottom attachment, or S390-27, 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 2630 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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