I know that at the track it is difficult to get a good rear view of whats behind you. I bought one of those JC Whitney wide angle mirrors that work pretty good but mounting it on the dash gives you alot of interference.
I recall last year at Pocono when Bill K busted his mirror mount on the dash and we duct taped it to the top of the windshield. This gave me an idea.
I took a spare piece of alum from a radiator mount I did not use and mounted it on the sun visor mounts. Easy to install and easy to remove.
Whaddayathink?
More pics at
http://www.priveye.com/mirror/
Roscoe