Window channel balance

A handy person from Coral Springs, FL says:
Hi:
my windows weight is 22 lbs
Balance width is 1/2"
length balance (metal) 29"

Can you said me which one is good for me

Thanks,
Carlos
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Manuela from SWISCO responded:

Thank you for sharing your photos with us. Your balance look similar to both our S351-29 and S390-29. The only difference between these two balances is the 'depth' measurement of the bottom balance shoe. You will need to measure the depth of your bottom shoe, the way it is shown in the diagram below, to determine which of the two balances is the better match. Whichever one chosen will go with a 2830 option that supports a sash weight of 16-23 pounds. 

Comparison of 15-001 & 15-002
A handy person from Coral Springs, FL says:
Thanks, I need to remove again the window to take an exactly measurement of this part
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Manuela from SWISCO responded:

Sounds good. We are here if you have any questions. 

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