Do these mount at the factory fog light holes, or do I need to drill?

They mount at factory locations — no drilling or cutting required. Designed to use existing fastener points on your vehicle.

The bulbs are already in there. Can I replace them later if one burns out?

Yes. The 9006 bulbs are a standard size and readily available. You can swap them out anytime without removing the housing.

Do these need to be painted or prepped before installation?

The clear lenses are ready to install as-is. No painting or surface prep needed — unbox and mount.