Will these bolt directly to my vehicle or do I need to drill into the bumper?

These mount at the factory locations — no drilling needed. Bolt straight in using existing holes and fastening points.

Does the switch come pre-wired or do I need to run wire from the battery?

The switch assembly is included and wired. You'll need to integrate it into your vehicle's electrical system — consult your service manual for the correct battery and ground connections.

What's the difference between smoked lens and clear for visibility?

Smoked lenses reduce glare from oncoming traffic and give a cohesive appearance, while still providing solid low-light output. They're not a visibility sacrifice — just a style choice that works well in fog or rain.