Window balance spring

Thanks for posting. This looks like a 15-087 Coil Shoe and 15-086 housing. These parts work with Series 180 Coil Balances, sold separately. To know what spring weights to pick for the new coil springs, give me the exact weight of the window sash this system supports, and I can work it out for you. Let me know if you have questions.

Series 180 coil balance diagram