Need left and right springs for bottom sash

Question

Hi I included 3 photos / hope it helps. I need a left and a right side spring (one each for one window). Would like to purchase the top plastic piece and bottom pivot piece for each as well. The ones I removed seem to be ok but I don't want to take any chances.
The window is an 8500/8501 series and is the 36x64 measurement.
Thank you!

Jasmine · Accepted Answer

Thanks for reaching out. Your shoe appears to be our 15-180 coil balance shoe. Take a look at the diagram below to compare the dimensions to your original hardware. I am confident this is the replacement shoe you'll need.

Alternate image for 15-180

This shoe is compatible Series 190 coil balances. To determine which coil you'll need, search for any stamps/markings that might indicate the spring strength on the metal coil. If there are no stamps/markings, you'll need to obtain the exact weight of your window and divide it by the number of coils in the window.