Volvo C30 2007 Service And Repair Manual page 157

ACCESSORIES AND EQUIPMENT Bumpers And Mudflaps - Installation Instructions, Accessories
Fig. 73: View Of Left-Hand Hole Drill Mark
Courtesy of VOLVO CARS CORPORATION
NOTE: Use a smooth drill bit head and ensure that the drill bit does not slip off the
surface to be drilled, the surface is small in relation to the completed size of the
hole.
Make a clear punch mark in the center of the marking for both front holes.
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Cover part of the underneath of engine compartment to prevent shavings from being blown up.
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Pre-drill with a 4 mm (5/32") drill bit, then a 8 mm (5/16") drill bit and finally with drill bit part no.

9814112 . Use a drill stop to prevent drilling through parts above.
Remove any shavings.
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NOTE: Rustproof the hole edges thoroughly and as well any scriber markings.
Remove the cover from under the engine.
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2012 Volvo C30 T-5