SPL Parts FKS Rear Knuckle Monoball Bushings (RKB) replace the stock mushy rubber bushings with Teflon lined FK spherical bearings, eliminating bushing flex and reducing bind/friction. This maintains optimum suspension geometry under load, to improve handling and feedback.Our FKS series Bushings feature FK Racing Bearings with a self cleaning 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 complete kit for one car. Made in the USA.Note: For Twinturbo models. Does not include HICAS balljoint replacement. Application List: 1990-1996 Nissan 300ZX (Z32) Twinturbo ONLY. 1989-1994 Nissan Skyline (R32) HICAS Only. Installation Instructions: SPL Rear Knuckle Monoball Bushings