Which part should I order?

Hey there,

Thanks for reaching out out! I am confident we can supply you with a replacement for the channel balances you need but I will need to see just one more detail to confirm the correct replacement. May I see a photo of the pulley system in the center of the balance? This is the where the spring and string meet in the middle of the channel.

Please don't hesitate to reach out with any questions in the meantime.