Pella sash balance
metal U channel dimensions NOT including plastic end caps
23-5/8 L x 9/16 W x 5/8 Depth, stamp 2320 BSI
Thanks for writing in! I am confident we can supply you with the replacement balances needed for your window. These are an extended travel channel balance and will need to be a custom assembly.
With that said, to confirm the exact balance needed for your window, I will need to see a clearer phot of the hook attached to the bottom shoe. This is one of the factors that will help us to determine the exact balance you'll need for our window.
Also, I'll need to know the exact number of balances you intend to purchase to confirm pricing and availability. There is an order minimum of (2) balances per custom balance.
Please feel free to reach out with any questions.