how to get out rusted rocker panel screws, I tried everything I know... Options

[914 RZ-1]

I had to take off my rocker panels. The screws on the passenger side were impossible to screw off. I tried: liquid wrench, screwdriver, screwdriver with wrench, screwdriver with impact wrench (stripped slot on heads), vise grips, bolt removers (with impact wrench), hammer (tapped screws to see if I could loosen the rust), screw extractor (broke 2 drill bits and 2 extractors) and torch. Finally gave up and used a cut-off wheel to cut the heads off.

There are bolt threads sticking out of the holes. I have sprayed them with more Liquid Wrench. Any ideas on how to remove these? I'd like to put screws back in the same holes. I got hex head bolts instead of those infernal cheeseheads.

[DM_2000]

When removing rusted bolts it is critical not to turn them too far in one direction as that puts too much stress on the bolt ( twisting it off ) or nut ( breaking the welds off ). Just work the bolt back and forth to wear out the rust.

I'd use a _new_ pair of real vise grips to grab what is left. A new pair will have sharp square jaws rather than worn ones found on used ones.

Liquid Wrench or other penetrant is fine, WD-40 is a miserable lubricant is is worthless.

If you heat the bolt, it will expand locking tighter in the nut so let it cool fully before attempting removal.

Bolt extractors are not as strong as the actual bolt, they mostly are for when a head is damaged but the threads are free. Bolt extractors are much harder than the bolt so drilling out a broken one is effectively impossible.