If you want to update your factory fog lights to brighter and more energy efficient LED lights, you'll need the proper mounting brackets. This pair of LED light mounting brackets from Rugged Ridge has a 3.5 inch circular hole that allows you to mount 3.5-inch round LED lights (15209.01) into the factory or Rugged Ridge bumper systems (XHD and All-Terrain) for the ultimate in nighttime illumination on the trails.. This pair of LED light mounting brackets from Rugged Ridge have a 3.5 inch circular hole to allow mounting 15209.01 lights into factory & XHD bumpers.