Drill out bumper cover

Fig 1: Identifying Hole Locations, Drill Bit Diameter And Hole Cutter Diameter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Drill out the bumper cover. Use a 9 mm (23/64") diameter drill bit
Open the holes in the bumper casing. Use a 31 mm (1 7/32") diameter hole cutter (P/N 9814069).