Another thing to consider is the dash mirror. Some put a riser under the stock dash mirror or replace the stem with a taller one. If you think you may do that, so as to see over the top when in the down position, make sure you do that, before you mount the right fender on the wing. You don't want to mount the side mirror on the wing, to find out down the road that when you raise the dash mirror, you have now blocked the view to the right wing mirror.
As far as convex mirrors goes, if you think you may want one and already have a flat mirror, you can find round convex mirrors that have double sided tape on the back, that you simply press onto your flat mirror. Look in your local car parts store like Napa, petboys, Kragen, Autozone, Target, Walmart etc. I'd go that route first to see if you like the look. If so, then you can commit to replacing the entire mirror with a convex mirror, or simply leave the press on mirror on your flat mirror. Five bucks is a lot cheaper than a replacement mirror, in case you don't like the convex image.
Cheers,
Roger