Richard,
This is the best I can do without removing the emblem. These measurements were made on the driver's side parallel and perpendicular to the ground.
From the rear edge of the fender to the upper right hand corner of the emblem - 12 9/16 inches.
From the lowest edge of the fender, following the curve of the fender up to the same upper right hand corner of the emblem - 13 1/2 inches.
That give you a datum point to make measurements for the holes (forward and down). Cover the area with masking tape and mark the corner point in pencil. From your badges, measure the distances from that corner to the pin locations and mark them. Remember, when you turn the badge over, it is a mirror of the hole location.
Repeat on the other side but the corner is on the opposite side of the badge.
Measure twice, drill once.
Now, what about the "MUSTANG" located lower on the fender?
Jim