Ok so I bought sp***r headlights before even joining the forum, and now after doing some reading would like to retrofit my OEM housings. I would still like to use halos though and can get them with the kit you guys say to use for retrofit. How do the halos mount and what size do I need? Also, will the HID bulb in the spyders be the correct bulb for the retrofit, in turn saving me some money? How can I tell what the bulb is?