Rather than relying on dimensions that may not be favorable, tape the trim on the car, measure so that it's uniform around the body, tape a tape line top and bottom to the edge of the molding, remove the molding, leaving the top and bottom tape lines in place, find and mark out the center between the tape lines, then place out your clip orientation, then drill or stud weld your clip attachment points along the centerline of the 2 tape lines.... this is how it's done when no holes are present, or your fitting a top to a non vinyl top vehicle, better to fit your trim to your car, rather than rely on erroneous dimensions
Mike