i agree use either a pipe wrench or use a dremel or something similar and cut a groove in the center so you can turn it with a screw driver. also use some liquid wrench or mmo on the bolt about an hour before you do this to help free it up.

 

Very active thread, after a 2 year gap...........

 

Weld the Vise grips to the Floor of the Garage..and Turn the Car..Counterclockwise I believe!..(well it is an Old thread!..may as well throw some Fun into it!)