Sport mirrors
Let's try this. I know the pic is a little dark, but I think you get the idea where the holes are located. Here are the dimensions taken from the rounded "point" on the leading edge of the door top.
The first hole is 5/16" dia. and its center is 15-3/8" from front of door.
The second hole is 13/16" dia. and its center is 16-1/4" from front of door.
The third hole is made by the sheet metal screw that holds down the base.
The best thing to do is find the location from these dimensions and then take accurate measurements from your actual mirror base. The first hole is for a through-bolt with nut inside door. The second is for the remote cables to pass through (assuming yours is remote).
Let me know if this is not clear to you.
Jerry
p.s. I haven't figured out how to get the pics to show up on this board.