Replace Caldwell Balance

A quick learner from NJ says:
I have a Caldwell Balance 31" long 1/2" wide with a mark on the steel "30 3 Caldwell GM". Which replacement part do I need?

Thanks
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Casey from SWISCO responded:
Thanks for posting. That "30 3" stamp only indicates the length and weight option. We need to see clear photos of the top and bottom of your balance to determine the series you need. Can you attach some photos to this discussion, please?
A quick learner from NJ says:
These are the photo's of the balance ends. I think I need the S380-31 with the 3030 option and the 18-124P balance stops. Please let me know if this is correct.

Thanks
User submitted photos of a window balance.
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Paul from SWISCO responded:
Thanks for your photos. You can use our S380-31 with the 3030 weight option. Let us know what you think.
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