Just one final thought that may help you guys out...
The highbeam projector housings use the standard H7 wire clip that you are probably used to. This type:
The lowbeam projector housing also uses an H7 bulb, but it uses the Mercedes-type twist in metal retainer. I personally don't like this design very much because it doesn't give you much assurance that (through time) the wings won't come untwisted and the bulb pop out.
Here's a photo of the exact retainer you will receive.
That retainer would work fine for halogen bulbs, but if you are using HID bulbs you need to pass the wire that goes to the ballast back through the retainer. You can modify your original retainers to allow the wire to pass through by snipping the metal, or you can purchase ones that already have the opening in them:
Last option. If you, like me, are afraid of the retainers coming untwisted through time, they do offer an H7 retainer that screws in to the mounting tabs. That style is cheap and looks like this. It would work perfect with these housings:
Either of these retainers can easily be purchased on eBay for less then $10 for the pair.