Fwd: Caldwell spring replacement

A quick learner from USA says:
I'm trying to identify a spring replacement for my window. This is a new discussion.

Pics are attached. The measurements are as follows:
Length - 29 inches
Width - 1/2 inch
Stamp says 28 3 Caldwell JM
Manufactured probably in 1994.

User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. I would recommend either our S351-29 or S390-29, depending o n the size of your bottom shoe. That is the only way to confirm which balance you have.
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