It more than likely is not the bulb but that they are just not adjusted properly. To check your adjustment park the TB on a flat driveway facing a wall or garage door or some flat surface. Park to the fog light is 25 feet from the surface. Now go measure the distance from the center of your fog light to the ground (you probably will find it between 8 to 10 inches). No go to the wall/door/surface and put a mark on it (or piece of tape) the same height from the ground. (so if light center was 9 inches from ground, put the tape 9 inches from ground). Turn on your fog lights. The top of beam should hit 4 inches below the mark (or tape) on the wall. If so they are in adjustment. If you make them shoot out light too high it will make the fog glare and also bother oncoming cars, that is why they have them set from the factory to aim towards the floor. There are adjustment screws on fog lights. If you get down on your hands and knees in front of your fog lights you will notice a hole next to each light (sort of at an angle) Shine a light down that hole and you will find an adjusting screw. But I bet if you test them first as described they are likely already aimed properly.
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