Caldwell channel balance

A home owner from San Antonio, Texas says:
My guess is the balance I need is a S390-34 option 3320 but wanted to check before ordering. The metal portion is 34" long and is marked 33 2 DL CALDWELL.

Thanks for your help.

Jim K.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I agree, the S390-34 looks like a great match. Just confirm that the nylon attachments are the same, and that the weight of your sash is covered by the 3320 option.
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