Will these headlights work with my factory bulbs?

These housings are designed to accept standard H4 bulb types. You'll reuse your existing bulbs — no need to buy new ones unless you want an upgrade.

Do I need to remove the front bumper or grille to install these?

No. These mount directly to the factory headlight buckets using the same attachment points. Basic socket and screwdriver work gets them in place.

Are these sealed against moisture?

The housings are sealed optical assemblies. Over time, any headlight can develop internal condensation depending on climate — if that happens, you're looking at replacement rather than repair.