Do these mount to my existing fog lights or replace them entirely?

These mount directly over your factory fog lights. They use the existing mounting points—no replacement of the actual light housings required.

Will my fog lights still work normally with the smoke covers on?

Yes. The smoke finish reduces brightness visibility slightly, but the lights function as designed. If visibility is critical in your climate, test them before committing to permanent installation.

Do I need any tools or hardware beyond what's in the box?

Mounting method not confirmed in product specs—test-fit before deciding whether you need fasteners or adhesive. Bring basic hand tools to your vehicle for installation.