Help with coil balances
Thanks for reaching out! In the first two photos, it appears you have the coil housing pivot, part 15-087 and the tandem coil housing, part 15-086. To confirm that these are the correct fit, look over the dimensions from the diagrams and compare them to your existing hardware.
These housings are compatible with the Series 180 coil balance springs. To determine which coils are needed for your window, you'll need to look for any stamps/markings on the metal coil. This stamp indicates the spring strength. If are no stamps, you'll need to obtain the exact sash weight and divide it by the total number of coils in the window.
In the last two photos, it looks like you have an older style coil balance shoe that is no longer made, however, it can be replaced with our 15-177. These are compatible with the Series 152 coils. You'll need to follow the same steps above to determine the spring strength.
Let me know if you have any questions.