SPL Parts FKS Monoball Shock Bushings (RKS) for the rear knuckle replaces 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.Our SPL Parts FKS series 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 6061-T6 Aluminum bearing shell provide an accurate fit. Sold as a pair.Made in the USA. Applications: 2003-2008 Nissan 350Z (Z33)2003+ Infiniti G35 Sedan &