All new forged aluminum design for 2022. Forged and CNC machined for perfect symmetry and great strength. These rear knuckles have 25mm Roll center correction / drop. Improves roll center, reduces camber and toe change for more grip and control. They are loaded with our famous low torque maintenance free spherical bearings for smooth suspension operation. Dual caliper brackets are built in so there is no need to purchase a separate dual caliper bracket. Compatible with Z33/Z34 brakes including our new Z33 Track Model calipers, sold separately. Compatible with 350Z, G35, 370Z, G37, 06+ M35 . Compatible with stock drum parking brake. ** ONLY REQUIRES MAX UPPER CONTROL ARMS (RUCA) BECAUSE UPPER BALL JOINT IS FLIPPED 90 DEGREES WHICH PREVENTS BINDING OF THE UPPER BALL JOINT. RUCA SOLD SEPARATELY.