Do these need bulbs, or do they come with them?

Bulbs are not included. You'll reuse your existing OEM bulbs or source replacements separately — check your owner's manual for the correct type.

Will these bolt straight onto my vehicle without modification?

Yes, these mount at factory attachment points. No drilling or bracket fabrication needed — basic hand tools and a socket set handle the install.

Do the projector lenses come sealed, or will moisture get inside?

These are sealed hard panel housings designed to protect internal optics. Inspect the seals before installation; if a unit shows damage, contact support for replacement.