To bad they are not complete Ballasts and bulbs != a true HID set-up. There is no reflector, no cut offs, not autoleveling, etc. Putting HID bulbs into a factory housing designed for a filament halogen bulb is merely putting the H (for half a$$ed) in HID. The only setup coming close would be to use the export assemblies for an LS1 Z28 (with proper ballasts and bulbs) and even those cutoffs are still designed for a halogen bulb.

The only way to do a true retro-fit would be to take a existing factory set-up (BMW, Benz, Audi, Cadillac, Lexus) and make it work with your car in it's given headlight area. This means the lens bucket, projector, ballasts, bulbs, and in most cases autoleveling as well all have to be used. Here is a good site detailing HID

 

Don't get those they are a rip off.

You can get the whole kits for ~ $300 now.