It is hard to find a car that isn't 12 Volt negative ground at this point. What I have noticed is there seem to be two sizes of cigarette lighters however. The vast majority in the USA seem to be one size, but I noticed the Plug that came with a Engle refrigerator had a different (larger diameter by about 2mm), however it also came with the smaller tip that could be swapped. Engle is Japanese, so I don't know if the larger size is typical of Asia, or where..
(BTW, and Engle fridge is a real one, not thermoelectric, compressor, the smallest weighs about 30 pounds, and in an hour can covert a 2 liter softdrink bottle to a block of ice). they have a thermostat, otherwise they can and do freeze things with remarkable speed.)