Here's another way to remove the broken outside bolt. Started replacing the shocks on my son's '02. We're in New England so you know there's rust. Soaked the rear bolts with PB blaster and then tried to shock them using the 14MM socket, 10" extension and 3lb hand sledge. Whacked the bolt head very hard but, of course, the outside bolt immediately snapped.
Tried drilling but the break was convex and I couldn't get the drill to start. Took off the wheel liner and could see the top of the bolt right behind the frame. Using just my 3/8 10" extension, it fit nicely onto the remaining part of the bolt, gave it a few more whacks then tried vise grips....no movement. Getting frustrated so gave the bolt a few more very hard whacks and when I went to put on the vise grips the bolt was at an angle! Put a screw driver on it and straightened it out with a couple of whacks then used the extension to whack the bottom of the bolt some more and now it's at a very strong angle. A couple of hits with the screwdriver to bend it back and it snapped right off! Mine only had one small spot weld on it so it was easy to snap. Fortunately the inside bolt came out without any issues. Got some grade 8 bolts and nuts at Lowes and the shock is now installed.
No BL, no angle grinder, no air hammer, no drill and no tap! We'll see how the passenger side goes next weekend.