Do I need fasteners to install this, or are they included?

The bracket itself is included. Hardware for mounting the bracket to the vehicle is not confirmed — verify you have M6 or equivalent fasteners that match your vehicle's factory attachment points before starting installation.

Will this work if my bumper has been replaced or modified?

This bracket mounts at factory attachment points on the front end. If your bumper or fascia has been replaced, test-fit the bracket first to confirm the mounting locations still align.

Does this bracket need paint or primer before installation?

The bracket finish is not specified. If you prefer it color-matched to your vehicle, sand lightly and apply primer and paint before mounting.