Sent a PM to Danny for parts quote. In the meantime, when you say side to side dimensions of the MMG do you mean with or without the trim piece? Please note that my MMGs are the older model with the 1" x 1/2" wood trim running full length on each side. This pic may give you an idea of what I mean:

Here's what they look like now after painting and reverting to the stock stands (set aside in the corner):

So, yes, black satin and black grills works for me. I don't think they will need to be tilted but that will depend on how high your boxes raise them. As you can see in the first pic, I had them raised at one time. About 6" I think.
Since I'm posting pics, thought I'd add one more:

WG