What will be the size of the balance

Hello, thank you for posting,

We can supply your replacement balances but it will need to be a custom order due to the length, extended travel pulley system and unique combination of end attachments. 

To further review, we will need to see the balance removed from the window with clear images of the top and bottom nylon attachments along with the metal hook clip.

We will also need to know the number stamped on the metal channel.

From there we can send over a quote for your review. Please provide the number of balances needed. For custom orders there is a minimum order of (2) required.