I double side taped (3M) to the inside of my fenders for the headlights and for the fog light ballasts i mounted them with zip ties behind the bumper. You'll see some spots after you drop down all the plastic sheilds under the car. When you look up you'll see several places. I had the hardest time getting my arm up in the to get the foglights in since i had no jack and din't wanna pull off too much plastic crap.