Will these fit without any wiring work?

These mount directly into the factory fog light buckets using the stock electrical connectors — no rewiring needed. If your truck doesn't already have fog lights, you'll need to run the harness and switch separately.

Do I need to remove the whole bumper to swap these in?

Not necessarily. You can access the fog light housings from behind the bumper opening on most trucks without full bumper removal — a panel or trim piece usually comes out first. Check your service manual for the exact procedure.

Can I replace just the bulb later, or does the whole housing need to come out?

You can reach and swap the H11 bulb through the back without pulling the housing — standard H11 replacement. Keep spares on hand since they don't last forever.