WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
Service Joint
Fig 1: Identifying Rear Fender Service Joint (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.
Service Joint
Fig 2: Identifying Rear Fender Service Joint (2 Of 2)