The right replacement part

Hey Gordon. This looks like a 15-180 Pivot Shoe, which uses our Series 190 Coil Balances. A stamp marked 440 indicates you need the S190-440 4 pound spring. For new covers, see the 15-181. Let me know if you have further questions. 

I'm afraid that most coil balance systems are modular, meaning that each component is sold separately. There is a good thing to that however--you really only need to replace the items that are damaged, and can usually reuse older but still working components.