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5 Using your contrasting tape once again, make a horizontal line on the wall/door two inches lower than measurement A (in our case 25-1/2-inches). Using measurement B, transfer that measurement to the wall/door and apply vertical tape lines at these measurements. For '69 Mustangs and their separate high beam lamps, a second horizontal line is made at the actual height measured in measurement A. Two additional vertical lines are then placed on this second line using your high beam measurement B.