Will these bolt straight onto my truck without any modifications?

Yes — these mount at factory points using the stock holes. No drilling or adapters required. You're looking at a bolt-in installation.

Do I need to replace the bulbs, or do these come with them?

Bulbs are not included with this set. You'll reuse your existing bulbs or source compatible replacements separately — standard H4 or comparable based on your truck's original spec.

Can I paint the chrome housing, or does it need to stay shiny?

The chrome finish is part of the design and brightness. If you want a different look, test-fit first and consult a custom shop on prep and paint adhesion — chrome surfaces require special handling.