window balance Spring

Thanks for reaching out. Your sash carrier looks a lot like our 15-102. Take a look at the measurements and compare it to your original to confirm that this is the correct replacement.

Alternate view of 15-102

The compatible coil springs are our Series 145 Balance Springs. To confirm the correct springs, you'll need to take a look at the metal coils to see if there are any stamps/markings. If not, you'll need to obtain the exact weight of your window and divide by 4, the number of coils in the window.