Coil balance assembly, no markings

Hello,

We'd be happy to help but we would need to see your pivot shoe and coil springs removed from the window to compare to our inventory. If you need the pivot bar as well, we'll need you to show us a photo of it uninstalled as well. Thank you!

We believe you have a similar style pivot shoe to our 15-191, which usually works with the Series 160 coil spring. Your spring looks different, though. Instead of installing in the shoe with tabs, it hooks in that little prong there. 

I think you could still use our 15-191 and Series 160 though but you would have to replace both parts for it to work. Thanks for posting!