Ok, here is the best I can come up with. Sorry, I am still stuck in the 19th century, if you want metric, you will have to convert on your own!
Between the wheel wells, 44.5 inches. Above the wheel wells, 57.5 wide.
From the top of the sliding deck to the head liner, 36.5. Now, the headliner slopes on both the right, left and rear sides. so the door opening is smaller, let me know if you need that measurement. The headliner slopes right above the inner sides of the wheel wells. In other words, you will have 36.5 high for the full 44.5 wide. But it will NOT be 36.5 high for the distances above the wheel well (6.5 inches on either side on top of the wheel wells). Let me know if you need that measurement.
On mine, there is 2 back seats and small center 3rd seat. While the 3rd or center section can fold down on it's own, it also folds down with the passenger rear seat. It does NOT recline on it's own. It will recline at the same time and manner as the passenger rear seat. Since I do not ride in the back of my own vehicle, I discovered something. The rear seats recline, but it seems only to 3 preset positions. Full upright, middle and when your really drunk......The following measurements are from all three positions.
One more thing, the inside of the rear tailgate is somewhat rounded. It's the inner door panel itself. So the measurements on either side are going to be shorter then the middle.
From the back of the drivers side rear seat, to the furthers right side of the rear tailgate, but still inside the wheel well, upright 34.5. Middle position 32.5fully drunk, 28.5. From the back of the center seat fully up right, 36 inches. Then middle 34 inches, and then fully reclined about 31 inches. Obviously the passenger side rear seat will be pretty much the same as the driver side. These measurements are all estimates with a tape rule, NOT exact but pretty close. Let me know if you need anything more.
Be safe and Merry Christmas.
