Hello Swedenbob,
Must look really sharp, to have them in aluminum. There is a small downside in this great idea, however. I found out that the one I made from raisin was very stiff and rigid, as I suppose the aluminum will be as well. This made my Sinclair very vulnerable. If you touch anything with this mirror, on the road or in storage, it has a tendency to break or tear off from your sinclair, leaving the C5 damaged (or just the mirror). Since I have mounted the soft plastic/rubber brackets, it is more flexible and the view is more smoothly. The hard bracket mounted mirror trembled much more.
I had the suggestion from a forum-member to use Sugru. This is a kind of plastic dow, (like chewing gum), that hardens in 24 hours after exposure to air. The bad side off this is that it is extremely sticky, so you have to make a bracket shaped slice, put plastic foil on both sides, hold the slice on the right spot on the side of the sinclair and push the mirror firmly in it. Let it be for an hour or so (with clamps), then with a sharp knife and a steady hand cut the Sugru that sticks outside the mirror in the desired shape. Let it dry a little more and you have a perfect shaped bracket. Doesn't matter that it looks not perfect inside the mirror course you can't see that. When dry, remove the plastic foil, drill the holes in the bracket and your done.
(
http://sugru.com/)
Hope it all makes sense!
succes Bob
greetz
Frank