We claim the ornamental design for the head mount unit for virtual reality system, as shown.
FIG. 1 is a front perspective view of a head mount unit for virtual reality system showing my design;
FIG. 2 is a rear perspective view of the head mount unit for virtual reality system shown in FIG. 1;
FIG. 3 is a front elevational view of the head mount unit for virtual reality system shown in FIG. 1;
FIG. 4 is a rear elevational view of the head mount unit for virtual reality system shown in FIG. 1;
FIG. 5 is a left elevational view of the head mount unit for virtual reality system shown in FIG. 1, the right elevational view being a mirror image of the left elevational view;
FIG. 6 is a top plan view of the head mount unit for virtual reality system shown in FIG. 1; and,
FIG. 7 is a bottom plan view of the head mount unit for virtual reality system shown in FIG. 1.