Do these use my existing bulbs?

Yes. These housings work with your current fog light bulbs — no need to source new ones. Just swap the old lenses for the smoked units.

Will I need fasteners or adhesive to mount these?

They mount at factory fog light points, so fasteners are already in place. No drilling, no adhesive required — install by removing the old housings and bolting these in.

Can I paint or clear-coat the smoked finish if needed?

The smoked finish is baked on. If you want to modify it, light sanding and clear coat will work, but test on a small area first to ensure adhesion. Most buyers keep them as-is.