1993 Cadillac DeVille Owner's Manual - Page 261

The equipment you will need is in the trunk under the mat and cover. Rotate theplastic cover nut and remove the cover to access the compact spare andjack. If your vehicleis equipped with either the Coachbuilder or the Heavy-Duty Livery Packages,you will have a full size spare tirein place of a compact spare. Start with the jack and the wheel wrench.