Do these mount at the factory fog light location without drilling?

Yes. These are designed to use existing factory mounting points—no drilling or bracket work required. Line them up and secure at the OEM locations.

Are the bulbs included?

The assemblies ship without bulbs. You'll need to source replacements that match your vehicle's spec—check your owner's manual or existing bulb for the correct type.

Will I need to tap into the factory electrical harness, or do these connect differently?

These come pre-wired and connect directly to your vehicle's factory fog light harness. If your vehicle had fog lights originally, the connector will match. If it didn't, you'll need to run power from your factory switch to these assemblies.