IMHO the pressure plate only needs replaced if it is damaged, which it rarely is. I have no idea about the Luk clutch but I have replaced many clutches on different rides over the years. The only time I ever ordered anything other than stock was on high HP motors.
1998 4.0 5 speed, Superior super 35 rear, Superior super 30 front, yukon air lockers x2. 3" Terra Flex suspension lift, 1.25" BL, 1" MML Engo 9K winch, Dick Cepeck Radial F-C 33/12.5/15.