Of possible interest, Tom, I got my GT mirrors from Russ at FiberSteel. They were about a buck and-a-half each, but they came with all the hardware and a non-side-specific template I needed to modify for my use. I don't have anything bad to say about them. They don't vibrate, the sight-picture out the driver's side is brilliant, and the passenger's side has a convex add-on that makes it useful.
I have a Ray Dot I got as a gift which will be going on a stalk in the center of the car when my roof project is complete.
There are a few different, equally good-looking options out there from other marquees, though. Don't rule them out:
http://www.ebay.com/itm/VW-KARMANN-GHIA-SIDE-MIRROR-FENDER-MOUNTED-NEW-/110599117527?pt=Vintage_Car_Truck_Parts_Accessories&hash=item19c0389ad7&vxp=mtr
http://www.ebay.com/itm/Fiat-500-600-850-MG-Abarth-Spider-Side-Mirror-Fender-/300505117060?pt=Vintage_Car_Truck_Parts_Accessories&hash=item45f7803184&vxp=mtr
http://www.ebay.com/itm/GT-MIRROR-FOR-FENDER-MOUNT-OR-CUSTOM-CARS-1PAIR-SMALL-/380340925520?pt=Vintage_Car_Truck_Parts_Accessories&hash=item588e15f450&vxp=mtr
http://www.ebay.com/itm/OPEL-Record-Kadett-Manta-Ascona-FENDER-MIRROR-NOS-/120855818178?pt=Motors_Car_Truck_Parts_Accessories&hash=item1c23916fc2&vxp=mtr
Or, my personal favorite for your application (which you already had):
http://www.ebay.com/itm/FORD-LOTUS-CLUBMAN-SUPER-7-ELITE-ELAN-RACE-DOOR-GUARD-FENDER-MIRROR-ALUMINUM-/140686869049?pt=AU_Car_Parts_Accessories&hash=item20c1974239&vxp=mtr
Here's the rear-view on my jalopy that Jim made reference to: