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My ballast isnt actually mounted. It has been pressed down between the battery and the back of the headlight. does not move. On the other side it is pressed between 2 things, cant remember what they are. But there is a space about an inch or so wide that is perfect to slide it into... right behind the low beam of the passenger headlight
BTW, my is OEM of Lexus (IS300, if I am correct). They are very thin (less than 1") so very easy to mount anywhere. If you have the Hella or Philips, they are thicker, and may not fit under the headlight.