Do these bolt directly to my bumper, or do I need to modify anything?

They're designed for direct bolt-on installation at factory mounting points. No drilling or cutting required — just fasteners and you're done.

Will the crystal smoke finish affect light output or visibility?

The smoke tint darkens the lens but doesn't compromise reflective performance. They still meet standard light output requirements for side markers.

Are the bulbs included with these reflectors?

Bulbs are not included. You'll use your existing bulbs or source replacements separately depending on your vehicle's socket type.