With the front securely mounted, we moved on to the rear of the Xterra and bolted the slider to the one existing factory hole with the provided M10 fine-thread bolt with washer and lock washer. With the slider in place, we were able to mark off the hole we needed to drill for the lower section of the mount. Before drilling our new holes, we loosened up the front and the rear top bolts and used a level gauge to make sure the slider was level. You can either drill the hole with the slider in place (although it will be a little cramped), or you can remove the slider, drill, then install it once again. We opted for the latter to leave us enough room to snap a couple of photos.