1998 Buick Riviera Owner's Manual - Page 216

These slots are to be used when loading and securing to car-c~arrier equipment. Attach T-hook chains on both sides, the slotted holes in in the bottom of the body rail, behind the front wheels and engineframe. Attach a separate safety chain around outboard end the 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. 5-11