Oldsmobile 1998 Intrigue Owner's Manual page 206

These slots are to be used when loading and securing
to car-carrier equipment.
NOTICE:
Please take care not to damage speed sensor
wires or brake hoses when attaching chains
and T-hooks.
Attach T-hook chains to the T-hook slots in the floor
pan support rails, just ahead of the rear wheels, on
both sides.
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