The bumper has rectangle shaped holes that slip/clip into a piece that's mounted to the bottom of the headlights on either side. Those parts are listed in the bumper's parts diagram:
71140-SZT-G01 Beam, R. FR. Bumper (UPPER)
71190-SZT-G01 Beam, L. FR. Bumper (UPPER)
The parts noted above, are mounted to the bottom of the headlight(s,) so you must remove the headlight to install/remove them, if they need to be replaced.