WARNING: This page is about a different car, the 2012 Hyundai Veloster. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Body Interior D Actual Measurement Dimensions
Courtesy of HYUNDAI MOTOR AMERICA
Fig 2: Locating Body Interior D Measuring Points (1 Of 2)
Courtesy of HYUNDAI MOTOR AMERICA
Fig 3: Locating Body Interior D Measuring Points (2 Of 2)