WARNING: This page is about a different car, the 2010 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power Steering Oil Pump Replacement Components With Torque Specifications - (VQ40DE Engine)
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Power Steering Oil Pump Replacement Components With Torque Specifications - (VK56DE Engine)