I took a piece of pipe conduit, put it in a mill and machined a tool. A hole drilled through the side(of the conduit) so you can insert a screw driver, gives you something to loosen/tighten the nut. Cost...free.
My 68 Dart uses those special nuts on the dash as well. I basically did the same thing with those except instead of a piece of conduit, I used cheap old sockets. My father-in-law has a mill so they were very easy to make.
As far as the bezel is concerned, I bought a reproduction and it didn't fit the contour of the fender. Since the fenders were Goodmarks, my first thought was that it was a fender issue. However, I tried my original bezel and it fit perfectly. I ended up having my original bezel rechromed but used the reproduction nut.