Billet would be sweet but you can make one out of tubing too. Cut it in half and weld small tubing to each half just big enough for bolts to slip through. 2 pieces each side.
oh ya, two on your bumper and two on the pillars, that will be plenty of light as long as you go with HID's... and you wont have to compromise your powder coating... they make clamps for your pillars!!