17" 16-A window balance

A home owner from Largo, FL says:
November 25, 2022
I am a bit confused. Says 16-A but channel measures 17" can you tell me the proper balance to replace this one?
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Emily from SWISCO responded:
November 30, 2022

Hi there!

Thank you for reaching out to us. Your balance appears to match either our S351-17 or S390-17, depending on the depth of the bottom shoe. Measure as shown below to determine the best match. You will also need the 1610 spring strength option, based on your 16A stamp.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
A home owner from Largo, FL says:
November 30, 2022
Thank you! This one is broken at that piece. Hopefully the other side is intact. Anyway to tell which length from the attached pic?
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Emily from SWISCO responded:
November 30, 2022

I'm afraid it's hard to get accurate dimensions from photos so we recommend measuring an undamaged bottom shoe just to be safe. 
17" Series 351 Channel Balance
17" Series 351 Channel Balance
S351-17
$9.34
17" Series 390 Channel Balance
17" Series 390 Channel Balance
S390-17
$9.34
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