Our SPL Parts FKS Rear Upper Control Arm Monoball Bushings (RUAB) replace the stock mushy rubber bushings with low-friction articulating spherical bearings, eliminating bushing flex and reducing bind/friction. This maintains optimum suspension geometry under load to improve handling and feedback.SPL Parts Monoball Bushings feature FK racing bearings with a self lubricating Teflon liner for long life and maximum performance. Highly precise (machined to 1/1000th inch) CNC machined T6061 aluminum bearing shells provide an accurate fit. Kit complete for one car.Made in the USA. Applications: 2003-2008 Nissan 350Z (Z33) 2008-2019 Nissan 370Z (Z34) 2003-2006 Infiniti G35 Sedan (V35) 2003-2007 Infiniti G35 Coupe (V35) Installation Instructions: SPL Rear Upper Arm Bushings