Need help identifying parts

Hello,

We can supply your replacement balances but it will need to be a custom order due to the extended travel pulley system and unique combination of end attachments. There should be numbers stamped on the balance channel that we'll need to confirm the spring strength needed to support your sash. If not, we'll need you to confirm the exact weight of the window sash. Please also write out the exact length of the metal balance channel, not including the end fittings. Lastly, we'll need to know the number of balances that you need, with the minimum being two. Thank you!