non tilt window balance

A handy person from CALIFORNIA says:
I HAVE A 22 INCH BALANCE MARKED( 21 2 FP CALDWELL) I BELIEVE IT MAY BE A S351-22 OR MAYBE A S800-22, BUT U TELL ME. PLEASE HELP!
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Mike from SWISCO responded:
The best way for us to help you determine the correct balance Series would be to see photos of your balance attachments. Since you already gave us the balance stamp, images of the attachments should suffice.

Please upload the images for us to take a look.
A quick learner from CALIFORNIA says:
THIS IS 22 INCHES AT THE METAL END TO END, DO U CARRY IT?
User submitted photo of channel balance and attachments.
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Mike from SWISCO responded:
It appears you will need the S390-22 (2120) as a replacement.
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