Here is what I laid out when I started thinking about doing this conversion. I have my old Aprilia headlight housing that is slightly damaged. I took the front lens off of it just for fun and to see how it was put together. I tossed around the idea of mounting a 3" PIAA fog lamp inside of it but the heat from the PIAA assembly was just too much to enclose into the headlight housing. The HID projector is perfect for this use. The diameter is just perfect (well as good as it could be) and the HID bulbs themselves run pretty cool so you don't have to worry about cooling them like halogen bulbs.