All models had the grey tweed fabric on the floor pan, very rear trunk wall and up and over the package shelf hump. The floor pan mat was a single piece that covered the entire bottom floor pan. Any additional mats, carpets, etc are not original and something that was added later.
All models other than Fleetwood and Eldorado had the interlocking grey speckle pattern cardboard: 2 interlocking pieces on left and 2 interlocking pieces on rear, and 1 at very rear.
For the Eldorado and Fleetwood, these cardboard panels were covered with the trunk fabric mentioned above.
NOTE The 1963 Coupes, and 1964 Coupes and 4 window Sedans had the spare mounted up on the hump below the rear package tray. Other body styles had the spare tire mounted in the floor pan via a J hook, large black painted metal pan and large wing nut. Fleetwoods and Eldorados have a form-sewn cover made of the trunk lining material over the spare tire. Other models with the spare in the floor could get this cover as a dealer option.
Note spare tire mounted on hump below rear package tray in a 1964 Coupe Deville. This would be the same location for the 1964 4 window sedans. Also note that the commonly used 235/75/15 radial is too wide to fit in this area and has to lay in the trunk floor.
The Jack "J" hook and base were held in place by black painted metal brackets attached to the right side cardboard insert, and held in place with 5/16" hex head short metal screws on front and flat speed nuts on back.
Note the Spare Tire mounted on right side of trunk floor on this 1964 6 Window Sedan Parts Car:
Note the Spare Tire mounted on right side of trunk floor on this Fleetwood 60 Special with the tweed fabric cover :
Trunk Hinge and Torque Rods