The windows are 35 1/2 x 37 1/2. They block and tackle balances.
Thank you for reaching out to us. We can help supply replacements for what's shown here but it will have to be a custom order due to the configuration. We'll use the 28" long Series 770 with the 28H stamp and swap out the default clip for the 15-170 clip. I'll just need a few more details so I can get this moving for you. Can you confirm and show me how your balance installs at the top? By four sets of balances, can you confirm that you need (8)?
Note, you can reuse the pivot shoe if it's in good condition. If you need a new one, we will need to see it removed from the window to narrow down some options.
Sure, we can help with this. Can you just confirm the number of balances you'd like to order?
Thanks for confirming! I will email you a purchase link for (8) S770-28 balances (28H stamp)with the 15-170 clip attached and a rivet in the top hole that you can use to place an order on our website. The S-clips aren't included in this link so don't forget to add them to your cart separately. Please note that there is a 5-6 business week lead time as well.
If you have any questions just let me know!