Hello -
I think you could make yourself very safe with a 17" Snap-On Panoramic Mirror for about $20 :
http://www.ioportracing.com/Merchant...egory_Code=MCI
On my car, I already use the big fisheye mirrors for trucks on the outer part of my mirror (about 3" in diameter). Currently I use the fisheye mirror to see what's in my blind spot, and then I use what's left of the flat part to figure out how close it is. I think that with the 17" panoramic, I could get away with a fisheye on the interior of the car.
Here is a website that has *very* expensive racing mirrors :
http://www.rdent.com/pages/mirror.html
Maybe 20 years ago I bought the Sebring Mirror style. It was a cheapo from JCWhitney, but it has the flush aerodynamic shape that I wanted (I am going to look for it!!!!). I'll bet that a mirror like this could help you comply with the legal requirement, reduce your drag, *and* look cool at the same time! Here is an example mounting (that's not me) :
Question : How about the "ultimate" fisheye? I mirrored ball on a stalk? What are the aerodynamics of a sphere?
CarloSW2