You would have to go with a whole kit. I have LED's for my fogs and I like then a lot!! As other people have mentioned you should get a kit as close to the original watt bulb as possible. We have the H16 bulb which is a 19W bulb. My kit has bulbs that are 20W each. If you go with a normal bulb that is higher then that or an HID kit it will be too hot and melt the housing..... Make sure you get a good quality kit too because someone else also changed there fogs to LED and wound up with a defective kit.