Two replacement Channel balances

A handy person from Florida says:
Existing Channel balance is Caldwell 28 3
The length is 29"
The sash weighs 16 pounds

I require two (2)
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Casey from SWISCO responded:

Hello,

As long as neither end attachment has wings, you could have either our S351-29, with a 15-002 bottom attachment, or S390-29, 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 2830 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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