Help buying window balance replacements

A quick learner from Campbell, CA says:
January 9, 2017
I need a pair of window balances to replace the balance in the attached pic. The markings on the balances are "27 4 D0 Caldwell." Please reply with questions. Thank you, Chris
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
January 17, 2017
Based on your photos, you may have our S390-28 channel balance. Check it out and see what you think.
28" Series 390 Channel Balance
28" Series 390 Channel Balance
S390-28
$10.97
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