Wide Angle Side View Mirrors made by ZOOM in Japan for the 2016+ ND Miata! It’ll remove the dead angles caused by the soft top roof and improve safety while driving as well as reduce glare from following cars. It will work with the defrosting/heating function, but it will take more time to heat up than the OEM mirror as it covers it.
ZOOM Wide Blue Mirrors should be ordered at REV9 Autosport https://us.rev9autosport.com/zoom-wide-blue-mirrors.html as they provide the best service and speed we've seen so far!