If your referring to the hitch plate that bolts directly onto the rear of the transmission, it's held on with both M12 bolts and M12 studs with nuts as far as I can make out.
The table in the service manual should two charts one for 4T bolts & nuts and another chart for 9T bolts and nuts & 7T nuts.
Tightening torque (4T) M12 is 434-520 lbs-in (9T) M12 is 781-954 lbs-in. I would assume that the bolts and stud/nuts for this plate are 4T as there is no notation against them in the parts manual, look like only the 9T are noted.
Hope this helps.