Looking for replacement window channel balance for my vinyl windows

A home owner from California says:
September 27, 2020
3030 number on channel. Spring is 15" 1/4 including hooks on ends. Channel is 32" including plastic clips. Windows installed in 1999.
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Bob from SWISCO responded:
September 30, 2020

Can you show me clearer pictures of those nylon fittings at either end of the balance? Can you also show me any stamp code on the metal channel? We'll do our best to narrow this down from there. Thanks. 
A home owner from California says:
September 30, 2020
Additional photos.
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Bob from SWISCO responded:
October 1, 2020

Perfect, thanks. See our S351-31 or S390-31. The only difference between these two balances is the bottom nylon shoe depth, so compare both with your old hardware to see what matches best. You will need a stamp option of 3030. 
31" Series 351 Channel Balance
31" Series 351 Channel Balance
S351-31
$11.52
31" Series 390 Channel Balance
31" Series 390 Channel Balance
S390-31
$11.30
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