they would have put an adapter plate inside the opening to convert them from D2R HIDs to H1 bulbs, just pry it out, probably siliconed in.
I did the rewire on mine, i had to buy a new plug harness and D2R bulbs (ebay). Easy enough to rewire, 3 wires from memory, +ve, -ve and a 'safety' wire which prevents power to the harness without the bulbs in place, if using an aftermarket harness i think this wire needs to be earthed ?? in order to overide the safety circuit. Best to pull out the whole headlight assemblies to see what you have left in place and a lot easier to do the re-wire. These are high voltage, so any joining should be done properly, with proper heatshrink etc, not insulating tape. The wires into your bulbs now should be the wires which were going into your ballast. Mine were cut so short i had to open up the ballast and re-solder new wires onto the circuit board (which is contained inside a block of insulating silicon). Pm me if you have any qu's.