Replacement Caldwell window balances

A home owner from California says:
Hi!

These balances are for Viking non-tilt vinyl windows approximately 25 years old. Marked "20 4 HP CALDWELL. I looked at your part identifier, and was pretty confident on the bottom shoe, but the top shoe looked a little different than anything else shown. What do you think?
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Casey from SWISCO responded:

Hello,

Take a look at our S395-21 channel balance with a 2040 spring strength option. Thanks for posting!

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