Will these bolt directly into my existing fog light housing?

Yes — these are direct replacements designed to mount at factory fog light points. No drilling or bracket modification needed.

Are the bulbs included and do I need to buy spares?

Both assemblies ship with bulbs already installed and ready to go. Keep a spare bulb on hand for long-term ownership, but you're set out of the box.

Do I need to adjust my wiring or do any electrical work?

No — these connect to your existing fog light harness without modification. If your original lights worked, these will too.