Yeah, I have stock headlights. And I retrofitted the projectors into them.
As far a your HID situation, not sure but I'm assuming you have HID "look alikes"?
To har HIDs in your car without projectors, you'll need to cut up the bulb holder to fit the HID bulb.
You don't want that. Trust me. Been there done that.
But with the projectors, they only take H1 fitment bulbs. Our cars take a H7 style stock.
Note, te H1 HID bulb is 100% different from the stock bulb.