Coil

Thanks for reaching out to us, Dona. This is a coil balance assembly. We don't sell an exact match for the pivot shoe but have a look at the 15-199 which uses the 1/2" S160 and 3/8" S165 coil springs. To determine the proper spring weights, you will need to divide the sash weight by the total number of springs in the window. 

To remove your hardware, we recommend the cut-out method as shown below. 

I'll be here if you have any questions!