I am looking for a chrome vintage style mirror to replace the stock one on my 260Z that can be bolted on from the outside. That's how I stumbled onto this thread.
My .02 cents....Over 30 years ago I installed a pair of Vitaloni Baby Turbos on my '77. As far as I know, they are still on that Z. I was completely satisfied....great visibilty (no vibration), blue anti-glare tint, never lost their setting (never moved). I don't know if Vitaloni makes them any more....that's why the NOS ones go for so much money.
I would buy a pair now but I am trying to maintain the vintage look on my 260Z.