Rivco window balances

A quick learner from Hampstead NH says:
August 21, 2018
So my house was built in 2004. The entire house has rivco windows and I would say about 85% of them are broken or not working. The one in the pic has numbers (11/2) unique 28-C-30. Most of my windows are the same size but I think there might be 2 different balances in each windows. Is this something I can get from you?
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Paul from SWISCO responded:
August 27, 2018

Thanks for posting. The company who made your original balance went out of business, but we believe you can use our S770-28 with a 28C stamp as a replacement. See what you think.
28" Series 770 Balance
28" Series 770 Balance
S770-28
$12.70
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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