I installed this panel a few days ago, but just getting around to updating today. It's a custom version of Overland Outfitters, LLP's
Narrow Rear Door Storage Single Pocket. The single pocket wasn't quite deep enough for my intended use - a JetBoil stove - so they were kind enough to allow me to have it modified to be 4.25" (108mm) deep.
This is perfect for me as my morning routine when camping is a breakfast of a cup of coffee and some oatmeal with fresh fruit and honey. With both doors open and the GP Factor fold-down table on one side and this storage panel on the other, everything is at my finger tips without having to dig through boxes or bags in the cargo area; heaven.
As you can see from the photos, it is also deep enough for a pair of 1-lb propane tanks, or a pair of 1-Liter Nalgene bottles, or mix-and-match to your heart's content. There is also space above the pocket for a small MOLLE bag - haven't decided if I'll add a bag or just leave it as a handy place for flatware.
I chose to leave the OEM plastic panel in place rather than remove it, so I had to pick up some slightly longer T30 dog-point screws to replace the factory screws. If you pull that plastic panel out when installing this one, the factory screws will work fine (I just hate having to keep track of old parts from trucks - Lord knows where some of my OEM parts are from my old Defender!). Install is as simple as unscrewing the bolts, lining up the panel, and re-installing the bolts - sub 5-minute job.
This is a great bit of kit - very well made. Also available in black if khaki isn't your style. I don't think this depth is available on the website, but reach out to them and I suspect they'll accommodate you if you'd like one.