Kevin:
FWIW I have fender mirrors mounted on my ERA that are very usable but they're not in the stock position. In stock position the fender mirrors are pretty useless.
A couple of things to consider before committing to the fender mirrors. Is there any sub structure in the fender that will prevent them from being mounted where they need to be to work? Can you mount them is a position that isn't too far off of the stock location to keep them from looking weird?
In my case I sat in the car and had someone else move the driver side mirror to where it was usable and then had the passenger side mirror held in the same place on the other side. It took a little moving around to get both in the right place but not a whole bunch. I also went with convex glass in both units which helped.
Here's a photo that sort of shows what they look like.
DonC
