Dometic. They specialize in coolers and fridges for boats and RVs.
The pics I included earlier (including them again here at full res) were taken in my 2019 MX P100D. I got the Dometic CFX3 35 powered cooler, and used the included DC cable to plug it into the DC port in the trunk area of my MX. Not only great for road trips, but great for keeping meats and dairy fresh when hitting multiple stores for food shopping. The fit was *absolutely* perfect with mere millimeters of clearance between the side bolstering of the seats and the sides of the fridge, and the height had the added benefit of being a middle armrest / surface for rear passengers.
Unfortunately, (or fortunately, depending on your perspective) the seats in the second row of the refreshed Model X Plaid (not sure about the LR) are fractionally wider than those in my previous MX. The seats themselves are a lot more comfortable, but the sides of the lower portion of the seat have a sort of dihedral to them, flaring outward (into that empty middle space) about half an inch more than the old seats in the previous gen MX. I've included some pics here so you can see the edge of those seats and the way the side bolsters flare a bit. Additionally -- the new rear entertainment / HVAC / cup holder assembly protrudes rearward about an inch further than it did in the previous gen MX (I keep telling everyone Tesla tweaked absolutely everything on the interior). People who have reviewed them online keep saying nothing in the center or rear seat area has changed, but they're just doing an at-a-glance review and don't have the perspective or experience of having lived with the original for three years. But I digress.
I dropped my existing Dometic fridge into the empty space between the center row seats on my new MX Plaid, and while it did fit with a little forcing, I have since decided against keeping it there for two reasons:
1.] It causes the side bolstering of the seats to bunch up a little, causing them to rub against the sides of the fridge when I power them forward for access to the third row, and I'm afraid I'm going to damage them over time.
2.] The fact the entertainment / HVAC / cup holder assembly juts rearward slightly more, and the cup holders have been lowered significantly (under the new display) vs. the old MX, the CFX3 35 fridge is just a little too long for the space now, so when the cup holders are deployed, the fridge handles interfere with the full articulation of the cup holders themselves.
Sooooo I'm stepping down a size. I'm going with the Dometic CFX3 25. It's about 5 inches shorter, which means cupholder action will work flawlessly now; is about 2 inches narrower, which means it'll clear the seats perfectly (as did the CFX3 35 in my 2019 MX P100D), and is about half an inch taller, which makes it an even better elbow rest / surface for rear passengers
I've just ordered and will let everyone know when it arrives. One nuance I should mention is that you must leave Sentry Mode *on* for the fridge to continue to receive power when you've locked the car -- for example when out and about running errands. I don't mind the extra power consumption -- have a big battery, so figured why not use it!
Again -- the first two pics are of the CFX3 35 in my 2019 MX P100D. The third and fourth pics are of the new seats in my MX Plaid. The third pic shows the curve of the side bolstering on the lower cushion. The cushion now flares outward into the empty center area, making the CFX3 35 a tighter fit than before.
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