Please help to review which item should I buy?

A quick learner says:
Thanks
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Bob from SWISCO responded:

Thanks for posting. We can help you replace these spiral balances, but we will need a little more information to be able to help. First, can you give us the length of the outer tube, as well as the length of the inner spiral rod? Also, could you take the photos with a different background? We need to identify the tip of the spiral but I'm having a little trouble doing that with the current photos. Many thanks.

A quick learner says:
Hi Sir,
Thanks you reply, please review the attached photos, and give advise which one should I buy?
Best Regards,
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Bob from SWISCO responded:

Thanks for getting back to us. This will actually have to be a custom order due to the balance's unique configuration. You should receive an email with a custom link allowing you to order these balances. If you have any questions, feel free to ask them here in the discussion thread. Many thanks. 

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