Replace Spiral Balancers

Your balance shoe is an older style that is unfortunately unavailable to us. I'm not sure that it's even made anymore. 

Are you able to remove the sash? It's not always possible on windows like this, but if you can do that then you may be able to install a 17-043 bracket at the bottom corners of the sash. That would allow you to install our S400-27. Look these parts over and see what you think.