If you simply pick xenon bulbs, they will not work in your fog lights, as you need the whole HID kit to make HID bulbs work (ballasts, relay harnesses, etc.). If you want better light output and yellow bulbs, you may be interested in upgrading your fog lights to LEDs. Unlike aftermarket HIDs, LED bulbs focus right in the headlight housing, because they are of the same length, as the factory halogen bulbs. Below is the LED kit that may be of interest for you: Lumen® - G7S LED Headlight Conversion Kit for 2014 Azera at CARiD
This kit features yellow tint film that you can use to change the color of these LED bulbs to yellow.
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