i drilled a hole under the break on the driver side. then installed a rubber grommet so my wire wouldnt rub aaint the metal.. it worked pretty well and i could not fit my huge 0 owg wire through any other hole that i found. if you rip up the carpet there is lots of huge gromets in the body of the car that lead straight to the frame for a nice ground though.. i can not remember if i found a bolt there to use or if i added my own bolt..