Do these mount at the factory headlight location?

Yes. These are designed for factory mounting points — no drilling or bracket fabrication needed. You'll be working within the original headlight pocket.

Will I need new wiring or can I use the truck's existing harness?

Mounting method and wiring compatibility are not specified in the product data. Test-fit one side first and verify connection type before committing both units. Your truck's OEM wiring may require adapter harnesses depending on connector type.

Are the bulbs included or do I need to source those separately?

Bulbs are not confirmed as included. Plan to source LED or HID bulbs separately based on projector type. Confirm bulb spec with the product team before install to avoid return trips.