two same brand tilt window channel balances

A handy person from San Antonio Texas says:
same manufacturer two windows
1/2 inch wide
ribbed
one pair at 35 inches long
spring stretch 19 3/8 inches
spring relax is 15 3/4 inches
one pair at 29 inches long
spring unknown
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Tom from SWISCO responded:

Hello! I think these are available on our site. They look like Series 770 balances. Take a look at the details of our S770-35 and S770-29 balances. I believe these match what you need.

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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