1998 Buick Riviera Owner's Manual - Page 230

Y 3. Rotate the wheel wrench to the to lower the left jack lift head until it fits under the vehicle. 4. Near each wheel well is notch in the frame to a position thejack head. You'll find the word JACK and an arrow stamped into the plastic near each notch. Position the jack under the vehicle and raise the jack head untilit fits firmly againstthe sheet metal next to the word JACK. Do not raise the vehicle yet. Put the compact spare near you. 5-25