Coil spring balances

A quick learner from Bluffton, SC says:
October 14, 2019
I'm looking for a couple spring balances for Capitol Windows (don't think they're in business anymore.) They are 29" long (says "29C" on the part) and 9/16 X 9/16 inch.
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Paul from SWISCO responded:
October 15, 2019

Hi there. Please take a look at our S770-29 balance. See if it matches up with your part. If so, then you can go with the 29C option. 
29" Series 770 Balance
29" Series 770 Balance
S770-29
$12.80
How to replace a tilt-window channel balance.
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