...light unit and bulb? my car has regular acura head lamps which a straight bulb surrounded by a reflective lens... i want to buy 2 universal halo lights which are 5 inches in diamater and are circular... is it possible to fit this in there and can the reflective piece and original bulb pop out so that it can work. and will it be functional ??

No. you need an HID retro kit first

buy Luminics bulbs..the ultra whites work well(compared to sylvania)