I installed a set of bi-xenon HID 6000K headlights, by Kensun, in my 97 Civic EX Coupe. They sent me the digital slim ballasts. Using a couple of cabinet brackets and flat pre-drilled mending plates (bent by me), I installed the ballast right behind the headlight assemblies. No need to remove bumper covers and stuff just to access them later on when they need to be replaced. Here are the pictures: