HID's may be more work than they're worth IMO. I replaced the fog lights on my '07 GS350 with Sylvania Silverstar Ultra's. They are bright, white with a near match to the whiteness of the HID headlights. I also replaced the DRL's, again using Sylvania's Silverstar Ultra's. These really light up the road!! 9005 for the DRL's, 9006 for the fogs and can be found at just about any auto parts store.