Volvo C30 2007 Service And Repair Manual page 192

ACCESSORIES AND EQUIPMENT Bumpers And Mudflaps - Installation Instructions, Accessories
Fig. 142: Drilling Holes
Courtesy of VOLVO CARS CORPORATION
Drill holes in the centers of the markings using a 3 mm (7/64) diameter drill bit.
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Drill out the holes. Use a 10 mm (25/64") diameter drill bit.
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Fig. 143: Enlarging Holes In Bumper Casing
Courtesy of VOLVO CARS CORPORATION
Enlarge the holes in the bumper casing using a hole cutter. Use special tool: 9997234 . Place the hole
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tool's support sleeve on the inside, and the cutting part on the outside of the bumper cover.
2012 Volvo C30 T-5