Channel Balance Inquiry

A quick learner from Rancho Cucamonga, California says:
I have submitted photos of my broken window channel balance and would like some assistance in which of your product I can buy to match it.

It is 28" in length and 1/2 wide, with a boot of 1-1/8". It is stamped 2720.

Thank you very much for all your time and help!
Bill
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Emily from SWISCO responded:

Hey, Bill.

Thanks so much for your patience during our busy season. It looks like you have either our S351-28, with a 15-002 bottom attachment, or S390-28, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. If your bottom shoe indeed measures 1-1/8", see the S390-28 with a 2720 spring strength option. 

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