If you measure trucks with factory mirrors, you will note that there is some variation as I believe that they layed these out and drilled them by hand.
This is the way we install the mirrors based on measurements that we use. Using the gasket as a template, center the gasket on the flat part of the door where the mirrors mount. On the left side the gasket is 6 1/2" from the front edge of the door. On the right side the gasket is 8" from the door edge. Locate the holes and drill 5/16" holes. (I believe that the factory used 11/32").
To mount we use ss screws screwed into the reenforcements. If you need a pic, I can post one.
Jim
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