Help identify spring type for window

Hey there, thanks for reaching out! Your windows appear to have the 18-186 coil balance clip and the 15-181 double support detent clip. These are typically used along with the 15-180 coil balance shoe. Look over the dimensions for the shoe below and compare them to an existing, undamaged, shoe to see if these are the right fit for your window.

Alternate image for 15-180

These pieces of hardware are compatible with 15-182 coil bushing and the Series 190 Coil balance spring. To confirm the right replacement springs for your window, you'll need to look for any stamps/markings on the metal coil.

If there are none, you'll need to obtain the exact sash weight and divide it by the total number of coils in the window. Then on the list of balances the first number after the 190 will be the weight you'd need to select.

(For example, if your window ends up weighing 24lbs, you'd need (4) 6lb coils. So you would need the S190-640.)