Replaces the compliant factory rubber bushing with a precision Teflon-lined spherical bearing for increased suspension rigidity, quicker steering response, and better handling. The housing is CNC machined from 6061-T6 aluminum billet, providing high-strength, light weight, and a perfect match to the factory mounting surface. The spherical bearing is securely clamped into the billet housing. Other designs use a small retainer ring to trap the bearing in a bore, which could cause annoying rattling and possible failure. The only upper mounts on the market that are fully compatible with all factory and aftermarket style upper spring seats. The 996 version of these mounts are the aftermarket rear mounts that have been exclusively certified for 996 Spec racing. Also available with 14mm adaptor spacers to fit JRZ shocks. Please inquire.