Hi Joe, I'm not sure if these will fit over the holes you are speaking about, but I replaced my single OEM with a pair and they look almost OEM and perform much better. Z-Car Depot link below.
https://zcardepot.com/catalog/product/view/id/807/s/mirror-exterior-chrome-right-left-240z-260z-280z-280zx-70-83/category/343/
Best of luck.