Identify part number

A home owner from USA says:
Hello, I need to order 2 replacement parts for one of my windows. The one I have is marked with Caldwell 30 3 FJ
Please see attached picture.

Thanks for your help,
Virginia
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Check out our S380-31 channel balance, I think this could be a match. Just make sure the end attachments match up. For the option, I recommend our 3030.
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