For information, this is how I got the bolt out. I did not lay on the floor on my back. I knelt outside the car and had my armpit laying over the sill area. I leaned inside the car holding a flashlight in my left hand to illuminate the head of the bolt. I then slid an 8" long (longer would be better) 5/8" box end wrench up alongside the brake pedal and placed it over the bolt head. I left the wrench hanging there. (It has tension applied when you turn the nut.) I then took an 8" long 11/16" open end wrench and loosened the nut. I then had to pry the bolt out with a pry bar.