Do you sell this window curl spring?
Hello,
We can't be positive with your part still installed but the 15-180 is a good place to start. Take a look and compare the dimensions below to the original pivot shoe once you are able to remove it from the window. If it's a match, see the S180 coil springs and related parts shown on this page that work with this assembly. Thank you!
It looks like your balances use the 15-181 double support, which indicates that you'll need two coils for each side. See the S180-05 coils, which support 5 pounds each. We do not have a video showing this exact assembly but we've related multiple coil balance videos on this page to help you through the process.