Anybody who has replaced their rear 6x9 speakers use a speaker harness w/their install? The part #s that are recommended do not work. They are Metra #72-6512 & #72-4570, these do NOT fit! Anybody know the correct part # and what company makes it? Where are they available? If not, I am just going to cut the plastic harness off and just run the wires directly to the new speakers.