well if its from a Base model ( 6 pins plug ) then the wireharness from a standard HID model ( 8 plug ) will fit onto the headlight.
You can just take the wireharness from the xenon headlight and add to the new headlight that is born with 6 plug connector.
I've had some issues with the lightning on my car, so i toke of the headlights. The car was born with Xenon, but the prev. owner had installed normal H7 bulps, so i bought new ballast and bulps and fitted em to the lights.
So either way, as long as you have the original wireharness you should be safe.