Windows are about 25 years old.

Hi there!

It looks like you have an older rod-type balance that isn't made anymore but our Series 775 channel balance uses the same shoe and can be used as a replacement. You'll just need to measure your bottom shoe and weigh your window sash to choose the appropriate spring strength option. There's a chart under the product description on the S775's product page that will show you which option you'll need based on the weight of your sash.

If you have any further questions just let us know.