Will these bolt straight into the factory holes?

Yes. These use the factory mounting points — no drilling or modification needed. Line them up and secure with the original fasteners.

Do I need to remove the bumper to install these?

Not necessarily. You can access the fender marker mounting area from behind the wheel well or bumper seam depending on your comfort level. Test-fit first to confirm your access path.

Are the bulbs included or do I need to transfer mine?

Transfer your existing bulbs from the factory markers into these housings. The smoke lens darkens what's already there — bulb type and wattage stay the same.