Volvo C30 2007 Service And Repair Manual page 341

ACCESSORIES AND BODY, CAB Interior - Installation Instructions, Accessories
Fig. 37: Tighten Nut Jacket On Eyelet
Courtesy of VOLVO CARS CORPORATION
Tighten the nut jacket on the eyelet on the left and right side.

NOTE: Store the removed seat wings in a suitable spot so that they can be
reinstalled if the child seat eyelets are removed.
CHILD SEAT, ISOFIX MOUNTING FRONT (2007-2012)
CHILD SEAT, ISOFIX MOUNTING FRONT
WARNING: Never place the child seat on the front passenger seat if the car is
equipped with activated SRS (Airbag) on the passenger side.
If you have difficulties installing a child safety product contact the
manufacturer for clearer installation instructions.
REMOVE / INSTALL
2012 Volvo C30 T-5