Will these bolt directly onto my truck without drilling?

Yes. These housings mount at the factory rocker points — no holes to drill or brackets to fabricate. You'll need basic hand tools and about 20 minutes per side.

Do bulbs come with these, or do I need to source them separately?

Housings only — bulbs are sold separately. Check your service manual for the correct bulb type and wattage for your model year.

Can I use these to replace cracked or yellowed fog lights?

Absolutely. These are direct replacements for worn or damaged OEM housings. If your existing lenses are intact, you can reuse them; otherwise, pair these with new lens assemblies.