I read as well that Luk was the OE clutch brand until I pulled mine and found it was a sachs, and it was stamped into the pressure plate. my Luk clutch came from autozone. I installed the LUK basic clutch kit with T/O bearing (not an upgraded model), a new flywheel, new slave/master cyl assembly, new fork, ballstud, and fork retainer spring clip thingy. put it all back together and the SOB still chattered.
my next clutch purchase for a jeep will be coming from the dealer, or it will be a mopar part from somewhere else if I can find such.