Removing old cab mount bushings from my 68 C10

[HeavyHauler]

This afternoon wanted to remove old cab mount bushings and hardware from my 68 C10 shortbed. The hardware is on their reaally, really tight and is somewhat rusty but I have seen worse. I tried various combinations of sockets and ratchets but I think what I really need is a really, really, long breaker bar or cheater bar. I have some long breaker bars but I didnt have the correct size adapters so I will go to Harbor freight tomorrow to see if they have a 3/4 to 1/2 socket adapter.

I am also thinking about just skipping trying to remove them by socket and just getting out a 3 inch cutting wheel and cutting them off or try to get a sawzall in there to cut the bolts off.

What is your favorite method of removing them if rusty and extremely tight?