Coil springs

I'm afraid it will be difficult to identify your hardware while it is still installed in the window. Take a look at the videos I have associated here. They will help you understand how to remove the hardware. In the meantime, you might want to get started by looking at the pivot shoes 15-111 and 15-191. These are both used with the Series 160 coil balance. You should find a number printed on your old coil that will indicate how may pounds of sash weight it can carry.