1993 Buick Riviera Owner's Manual - Page 209

Put the flat end into the notch and carefully pry off the small cover. 1 i i " ,,. , 'I' Remove the lock nut by inserting the key wrench into the ,hole in the: center the wheel of ,coverand turn it q1ockwis.e to loosen the lock nut completely. If your Buick has aluminum wheels, there no wheel are covers that have to be removed. Now you are ready to start using the and wheel jack wrench to raise your vehicle. Using wheel wrench, the loosen all the wheel nuts. Don't remove them yet. 207