24" window balance

A handy person from San Diego, CA says:

Patti  post 01

The numbers on the balance are

23 2 BV CMC

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A handy person from San Diego, CA says:
Second post with four additional photos
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Emily from SWISCO responded:

Hi, Patti.

It looks like you have either our S351-24 , with a 15-002 bottom attachment, or S390-24 , 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 spring strength option of 2320.

If you have any further questions just let us know! 

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