Replacement coil balance parts

Hello,

We can't be sure without seeing photos of an undamaged coil balance assembly removed from the window but the S140-12 would be a good place to start. Take a look and compare the specifications below to yours. Also, note that the 12 stamped on your balance cover indicates that the springs are calibrated to support a sash between 23-24.99 lbs. Thanks for posting! 

Alternate image for S140-12