Does this bracket require any drilling or modification to the bumper?

No — the bracket mounts at factory attachment points without drilling. You keep your bumper untouched and can remove it anytime without damage.

Will the black finish match my bumper if I have a different color car?

The bracket ships in black. If your car is a different color, you can prep and paint it to match — the powder coat is paintable with standard automotive primer and paint after light scuffing.

What fasteners do I need to install this?

Hardware and fastening method aren't specified in the product listing — verify your vehicle's factory attachment points and have appropriate hardware on hand before installation, or check your Corolla service manual for the correct bolt specs.