If you can get a vise grips on the edge of it, bite down real hard. I have used a vise grips for many a stubborn bolt. Oil drain plugs, you name it.
(of course everything eventually gets rounded off, so just bite down harder

 

Drill it and use an EZ-out (screw extractor). Or, better yet, use a reverse cutting drill bit (lots of sources online!) to drill it out-that in itself should loosen the frozen bolt without using an EZ-out, too. Been there, done that!

 

I don't know how big your vise grips are but I would try a bigger pair on the metal part that is in the pic even if you have to cut the head off. First get some locktite remover. If that fails again, start with a small dia drill & work your way up in dia drill & that should pop the head of the bolt. They make stubby drill bits if you have the room. Good luck

 

I was going to say use a grinder to square off the bolt, then your vice grips would have a couple flat sides to grap on to.....but, your done, so good for you!

 

Here's the little bastard with its head popped off:



And here's the collateral damage (from the snapped 1/8 drill bit):



I assume some touch-up paint will be fine, but it still sucks. My impatience could have cost me more...

 

Nooooooo!!!! Sh*tty I told you not to slip

 

Touching up chips in metallic colors doesn't work very well. Yes, you can improve upon the chip, but making an undetectable repair is next to impossible.

 

There are many ways and methods and I have used them all, even freezing bolts with nitrogen liquid. Generally, I do not waste time anymore with EZ-out's with stubborn bolts. I just get out the drill and drill the bolt out completely. Use one or two drill size smaller than the bolt shaft and drill straight. When you break through the EZ-out can be used to try to back out the hollowed bolt or you can collapse the thin bolt with a small thin chisel. If that does not work or you damaged the threads just drill out to a larger size and re-tap the threads and insert a larger size bolt. This method is simple, easy and never fails. It is the ultimate solution and sometimes the only practical way to get the job done. In your case, that bolt was likely cross-threaded when inserted (I seen dealers do this many times) so drilling is the best way to go. Nothing wrong with trying other methods, just use the drill when all else fails.

 

Blame it on the kid in the reflection!

 

lol they all look innocent