The ornamental design for a frontbumperunit for motor vehicle, as shown and described.
FIG. 1 is a perspective view of a front bumper unit for motor vehicle;
FIG. 2 is a front elevation view thereof;
FIG. 3 is an elevation view thereof from the left side; and,
FIG. 4 is an elevation view thereof from the right side.
The broken line showing of the front bumper unit for motor vehicle is for the purpose of illustrating portions of the front bumper unit for motor vehicle and forms no part of the claimed design.