You don't say what brand!
Mine is a Bocar and it is mounted across the main chassis rails (existing holes needed to be enlarged to 13mm) and to the bumper mounts just forward of the front wheel arches. In both instances, steel adapter mounts are used...and the bar bolts to these. From memory, the main mounts are U shaped steel section (one on each chassis rail) while the side mounts are flat bar with a hole in either end.
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