Window balances

A quick learner from USA says:
Need to replace these balances hope the pictures can help to match new ones.
User submitted image of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting! This looks a lot like our Series 140 coil balance system. Based on the number printed on yours, I'd go with our S140-9. These come in left and right, and each side carries 9 pounds for a total of 18 pounds of support.
A handy person from Wilmington DE says:
Thanks for the info regarding the window balances
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