2004 Buick Regal Owner's Manual - Page 295

Storing the Flat Tire and Tools {CAUTION: Storing a jack, a tire, or other equipment in the passenger compartment of the vehicle could cause injury. In a sudden stop or collision, loose equipment could strike someone. Store all these in the proper place. After the compact spare tire has been installed on the vehicle, store the flat tire in the trunk. Use the following procedure to secure the flat tire in the trunk. When storing a full-size tire, use the extension with the protector, located in the foam holder, to help avoid wheel surface damage. To store a full-size tire, place the tire valve stem facing down, and then remove the protector and attach the retainer securely. Store the cover as far forward as possible. 5-87