I was just wondering if the bulb size for the for lights the same as the headlights and if we could use stock HID ballasts and bulbs to fit the fog light housing. I wanted to see if it was possible to fit another pair of stock HID's for the fogs?

I don't think you can do that. You would need another ballasts and you would have to get a rebased D2R bulb.

no can do,its a difffrent bulb

why do that when you can do this?
https://g35driver.com/forums/lighting/101431-2006-style-quad-projectors.html