[tauntdevil]

Honestly you will probably have to pull the engine and rip the mount off so you can grind the metal down for it to pop off. Thats what we had to do to a setup that the rust had been so bad that it wouldnt come loose at all.

If you wanted to try without pulling the engine, you can try buying a hole saw kit and try drilling where the stud is so it will just be a tube instead of a washer.
If that makes sense. Basically drilling out the sides so it just slides out.