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Neither the 7-seat with monoposts, or the 7-seat with bench type seats have any latches to remove the center seat. The mono post center seat can be removed by unbolting it from the floor, but you will need to cover the hole and disable the sensors. Someone had removed the center seat and posted on this forum about it.
Supposedly on later firmware revisions they removed any car freak outs from monopost center seats being removed. Not sure. Someone could also probably find the right ohm resistors to put on the sensors and make them shut up also.