Do these bolt straight into the factory headlight buckets?

Yes—they mount at factory points with no drilling or bracket fabrication needed. Your existing hardware works.

Will I need to reprogram my truck or add a relay harness?

No. These plug directly into your factory connectors and work with your truck's existing electrical setup. No module required.

What's the difference between the projector lens and a reflector headlight?

Projectors focus the LED beam tighter and sharper, which reduces glare for oncoming traffic and gives you better low-beam cutoff. Reflector units spread light more broadly. Projectors are cleaner on the road.