Balance for two windows

A quick learner from USA says:
January 3, 2017
I need four replacement balances for my two "Seasons Shield" windows. I don't know what to order.

Rebecca
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
January 10, 2017
It's tough to make out your balance's nylon caps, as your pictures are somewhat small. That said, start with our S390-27 and let me know if this will work.
27" Series 390 Channel Balance
27" Series 390 Channel Balance
S390-27
$10.55
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