Well, I have a conclusion to my problems from yesterday.
As I said I went ahead and ordered a rear wheel bearing from Advance. I picked it up then went to my uncle's place. He already had my cousin's Mustang out of the garage/shed so I pulled right in. The first thing we did was try to find the metallic noise. Took the right front wheel off, looked around at stuff, cut the wheel both ways and rotated it and could see nothing hitting. We thought maybe the anti-rattle clip was just catching the rotor, so we bent it a little, put the wheel back on, took it for a ride, and the metallic noise was still there. Pulled it back in, took the wheel back off, and decided to pull rotor and everything. I immediately spotted the issue. The damn "bracket" that bolts between the hub and spindle must have bent ever so slightly on the piece that sticks out toward the bottom and the rotor was rubbing it on left hand turns. I have no idea why that piece is even there, it holds nothing on my car. Anyway, put it back together, took it for a ride to verify, and no more metallic noise.
I took both my cousin and my uncle with me to verify where the howling bearing noise was coming from. Both said right rear. This goes along with everything you would think since the noise goes away on right hand curves. Pull back in the garage, take everything apart, put brand new rear wheel bearing in, put it back together, take it for a ride...... and I STILL have a howling noise.....
We all figured, okay, the right bearing came out in good shape, so lets swap out the left bearing for the old right bearing. Did that, put it together, took the car for a ride, and ....................................................... silence.
CLIFFS: Metallic noise was from ABS sensor bracket. Bearing noise was fixed after changing all 4 wheel bearings, and it was the left rear the whole time.