[GaryR]

Originally Posted by Flat Six

No affiliation, but this thread got me thinking -- found these:

New Pair Set Power Side View Mirror Glass Housing 06 12 Mazda MX 5 Miata | eBay

While you most likely could get them to function correctly mounting a big flat base on a curved door panel won't work well.. and that's IF that mirror head would rotate enough to be 90 degrees to the ground.