Please refer to the Spring Calculator Link below for guidance on spring sizes. Most people will use 6" long springs. Note: Does not fit G35 models with Rear Active Steer. Applications: 2003-2008 Nissan 350Z (Z33) 2003-2006 Infiniti G35 Sedan (V35) 2003-2007 Infiniti G35 Coupe (V35) Need a replacement rod end? SPL Rod Ends Installation Instructions: SPL Rear Mid Links SPL Rear Mid Link Spring Calculator