Well, I am done. What a PITA it turned out to be. It was easy enough to get to the speakers, but the cutouts for the screws did not match up completely even. I held down each speaker with 3 screws, but will need to drill out the speakers a bit to completely fit them in perfect.
Definitely an improvement in sound, if a little bit too bright. I am happy. They fit perfectly otherwise.
Oh yeah, I still don't know the impedence, there were no markings at all to suggest it. lol