SPL Parts FKS Rear Knuckle Monoball Bushings (RKB) 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.Our FKS series spherical bushings feature FK Racing Bearings with a self cleaning and lubricating Teflon liner for long life and maximum performance. Highly precise (machined to 1/1000th inch) CNC machined 6061-T6 Billet Aluminum bearing shell provide an accurate fit. Sold as a complete kit for one car.Made in the USA. Application: 1989-1994 Nissan 240SX (S13) 1995-1998 Nissan 240SX (S14) 1993-1998 Nissan Skyline (R33) GTS ONLY Installation Instructions: SPL Rear Knuckle Monoball Bushings