They have a unique method of attachment as it is a one piece assembly which allows the bracket to be rotated in different ways. I believe it was a 19mm and on the Wrangler you will need to remove the 4 small 10mm screws holding the fairing cover over the steering (in front of the bumper as they say jeep). Remove these and installing the lights will be quicker and easier when needed. These lights are bright. They look sharp and I had enough wire and flexible tubing to reach them (the part you removed for installation). I ran a black hose under the black landing gear. Well the whole jeep is black lol :-) Get a rocker switch to mount on the dash, console or grille to the rear wiper switch and also your cable to connect it to the headlights. One of these goes to the power supply which I use through the built in fuse on the positive side of the battery then the rocker, ground rocker and the other wire goes to the headlights which you wire together. Flashlights require a ground wire to the black wire. The power cable is red. I have a 3" ring bumper tube and they fit perfectly with just enough clearance not to look too big or too small. Grab some KC cases and you'll have a big rig look. Have fun Robert
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