coil balance

Hello, thank you for posting,

Your balance assembly resembles the 15-177 pivot shoe that is compatible with the Series 152 coils springs. These springs are compatible with the 15-143 bushing, 15-144 bushing cap and 15-145 support barrel.

Alternate image for 15-177

There should be a number stamped into the metal coil that indicates the weighted coil spring needed. If not, please provide the weight of the window sash for further assistance. Thank you!