The contact owns a 2017 Ford Explorer. The contact stated that the right and left roof rails were separating at the rear of both roof rails from the roof of the vehicle. The contact stated that a gap of approximately one-quarter of an inch was seen on both roof rails. The contact had not taken the vehicle to an independent mechanic or dealer. The vehicle was not diagnosed or repaired. The manufacturer was not informed of the failure. The contact researched online and related the failure to NHTSA Campaign Number: 21V316000 (Structure); however, the VIN was not included. The failure mileage was approximately 110,000.