Spiral Window balance

Hello,

It looks like you may have an older style balance with the bracket riveted to the spiral, which is no longer available. If the plastic housing tube of an undamaged balance measures 5/8" in diameter, you should be able to use the S500-30 spiral balances and 17-012 brackets to install them. Take a look and see what you think. 

How to measure the length of the Series 500 spiral balance.

Dimensions for 17-012

Additional dimensions for 17-012

Guide: How to adjust a spiral balance on a non-tilt window