I never thought about the pacemaker and i'm pretty sure that the plate is a reference to MK Sr. I don't remember it saying that MK Jr. had one.

I was watching Knight Fever and I was wondering if anyone caught the reference to Michael Knight when Dr.Graiman is explaining that the virus can only kill people if they have a pacemaker, a steel hip or a metal plate in there head which the original Michael Knight had in his head.