I have seen some complaints about the Dorman replacement...the ignition switch not latching onto the assembly, the rotational fitting of the actuator relative to the ignition switch being to far advanced or retarded or the thin sliver running down the centre of the pin that presses against a separate switch in the ignition switch assembly to warn of "key in ignition" being too long or to short.
So sometimes a bit of modification is needed.
I had a weird problem with my manual Export 2002 CRD when it was just out of warranty.
Being a manual transmission there is a clutch override switch on the clutch pedal that prevents the engine turning over the unless the clutch is depressed.....not in operation if you are in Low 4 wheel drive so that you can start the Jeep in gear while stalled on a sharp incline.
So normal starting procedure would be to switch on ignition, depress clutch pedal to the floor and turn ignition key to "start" to get engine going.
Suddenly I had the case that with ignition "ON" the engine would start by itself the moment I depressed the clutch.
This was with the original factory fitted parts but somehow the ignition switch became too far advanced so that it was in the "start" position already. Strangely the starter did not keep rotating.
I had to elongate the mounting hole on the actuator assembly so that I could retard the position of the ignition switch and it has worked fine ever since.
So far I have not had this failed actuator pin assembly problem I spite of my Jeeps age but I do very few short trips...more long distance....so there are less ignition ON-OFF actions involved that most drivers probably have to do.