Balance need replacement

A home owner from Oklahoma says:
I've included photos of my balance. The metal channel measures 27in. Attached are photos.
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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.

A home owner from Oklahoma says:
Thanks for getting back to me so quick. It looks like the item i need is s351 27.
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Casey from SWISCO responded:

Great, you are welcome to place an order for your replacement balances directly on our website, or feel free to give our customer service team a call at (888) 991-1929 for assistance. Please let us know if you need anything else. 

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