The one under the oil cooler is a rounded rectangle in shape and has 5 small rectangle shaped connectors. Mine is tightly secured to the middle of subframe, only accessible from underneath and did not have a cover or a blanking plug in. The one underneath is a DIN socket the seat has a spring loaded cover.
I added another DIN plug mounted on the screen subframe connected to an Eastern Beaver 3 position switched fusebox (ready wired kit) that I also run two heated jackets from. In addition I have a two pin Tamiya connector direct to the battery for charging and to attach unstitched accessories like a phone charger so I can charge phones etc when camping without the engine running.
