We need 2 of these parts. Can you help?

Hello, thank you for posting,

We should be able to assist with a replacement for your channel balance. To further review, we will need to see pictures of the top and bottom nylon attachments. We will also need to see the inside of the metal channel where we can view the connection point between the spring and pulley system. From there we can narrow down the series needed for your window. Thank you!