1994 GMC Safari Owner's Manual - Page 209

You have two wheel blocks stored with your jack. Place the blocks at the front and rear of the tire farthest away from the one being changed. That would be the tire on the other side of the vehicle, at the opposite end. Put your spare tire near theflat tire. Remove the wheel trim. If you have an aluminum hub cap, remove it by using the flat end of the extension. Pry along the. edge of the cap until it comes off. Be careful; the rim edges may be sharp. Don't try to remove it with your bare hands. If the wheel has a plastic center cap, you do not have to remove the center cap to loosen the wheel nuts. . 5-25