Agreed. But then again, I already said that in the other thread.
Not sure about the need for black paint. I didn't paint mine (it's pewter) and I can't say it (the pewter color) ever caught my eye when looking at the tires and wheels.
You probably won't have to trim the outer edge of the plastic so the part you will trim will be inside the well. Or at least that's the way it worked out on mine.