get yerself a cheap 4" grinder, throw a cutoff wheel on it,and cut the bolt head off. You might scratch the inside of the flare a little, but who cares, you can't see it. Thats how I did mine yesterday. then I took a small puch and popped the nutserts out of the fender.
lookin to get back in the Jeep game ASAP!! Already got the SBC,700r4 an 205t-case. can't wait!!