Replacement Balance

Good Morning,
I need to replace the balances on several windows in my home. I have removed the balances from one of the windows and am attaching a photo of it for your reference, review and comments.

The window measurements appear consistent with that of an Anderson Slimline 200 window 3842, with an overall unit dimension of 3'-9 5/8" x 4'-5 1/4". I am attaching a photo of the glass etching for convenience and reference.

Any chance that you can tell me what the correct replacement balance is?

Thank you in advance for your reply and comments.

Leo