I just measured the two doors that have factory holes punched in them for the sport mirrors. The measurement from the front edge of the driver's door to the center of the single hole is 7". The same measurement on the passenger's door is 8" or 1" longer than the left door.
I use the gasket for locating the mirror, centering it on the mounting surface, mark the hole locations and drill the holes with a 11/32" drill. This gives you some adjustment room.
Jim
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