Do these need any prep work before installation?

The chrome finish comes ready to install — no painting or sanding required. Just unbox, test-fit the assembly in the housing, and confirm the connector seats fully before buttoning everything up.

Will the factory bulbs work with these headlights?

These assemblies are designed to accept your OEM bulb type. Check your owner's manual for the correct bulb part number, then seat it into the socket inside the new housing the same way you would in the original unit.

Do I need to buy fasteners separately?

These mount at factory attachment points, so your existing hardware should work. If any fasteners are stripped or missing, you'll need replacements — but the assembly itself ships without mounting brackets or bolts.