Will this bolt directly into my Expedition without any modification?

Yes. This assembly uses your factory mounting brackets and electrical connectors — no drilling, cutting, or rewiring required.

Do I need to remove the entire front bumper to swap this out?

Not necessarily. You can access the headlight from the engine bay side in most cases. Your owner's manual or a shop manual will walk you through the exact steps for your model year.

What's the difference between this and an aftermarket headlight?

This replicates the OE styling and light pattern — if you want to keep your Expedition looking stock while replacing a failed or damaged unit, this is the right choice.