My fogs went out a few months ago and it turns out that it was simply one of the bulbs out. My housings were too corroded and rusted to replace the bulbs so i bought an aftermarket set and made a bracket to fit them. I would consider replacing the bulbs with maybe some piaa bulbs instead of changing the entire housing if you can. But if you want to go all out go with the Hella DE and make sure you get the 4runner specific.