Window Balance for old Rivco, 1 1/2 Unique 28-C-30

A home owner from NH says:
September 4, 2018
Can you please help me find the right replacement balance for my Rivco windows. Pictures show " 1 1/2 Unique 28-C-30" marking on 28 inch long balance and 1/2 inch square cross section (all sides are 1/2 inch wide). If I can find the right balance, I need to repair 3-4 windows.

Thanks!
Sue
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Paul from SWISCO responded:
September 10, 2018

Hello, Sue. The manufacturer of these balances, Unique, has went out of business, but we can still get you what you need. You can go wit our S770-28 balance with a 28C option as a replacement. Take a look and let us know if you should have any further questions about this part. 
A home owner from NH says:
September 19, 2018
This was exactly what I needed! Thanks! The balances fit perfectly!
28" Series 770 Balance
28" Series 770 Balance
S770-28
$12.70
How to replace a tilt-window channel balance.
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