1997 f150 vacuum reservoir for egr system that's mounted in the inner wheel well not the HVAC one that's located behind the battery what is it called and how do I fix it if it was crushed?

The vacuum reservoir you're referring to is typically called the EGR vacuum reservoir or EGR canister. If it's crushed, it will need to be replaced, as it can't be repaired effectively. To fix it, remove the damaged canister by disconnecting any attached vacuum lines and mounting hardware, then install a new one by reversing the process and ensuring all connections are secure. Make sure to check for any vacuum leaks in the surrounding lines after installation.