Need New Coil Balance Springs

It's difficult to say for sure what you have from this photo. A lot of details are obscured while your coil balance is still in the window track. That said, the pivot shoe looks similar to our 15-180. If that's a match, then you'll also want the Series 190 coil spring, 15-181 double spring support clip (assuming that you have two coils and not just one that has come unsprung), and finally two 15-182 barrels (again, assuming you have two springs).

Look this hardware over and compare it to what you have installed now. If they differ in any, please let me know how and we will try to chase something else down for you.