Cadillac 1998 Seville Owner's Manual page 249

These slots
are
to be used when loading and securing to
car-carrier equipment.
Attach T-hook chains on both sides, in the slotted holes
in the bottom of the bodyrail, behind the front wheels.
Attach a separate safety chain around the outboard end
of each lower control arm.
I
NOTICE:
Be sure not to attach the safety chain to the
drive axle. This could cause damage to the drive
axle boot.
5-12