The Rekudo upper and lower control arms are one part of a fully engineered suspension system for the 1970-1981 Chevrolet Camaro & Pontiac Firebird. This suspension system is an auto-cross inspired modern suspension system that retains the original equipment (OE) appearance & strength with stamped steel control arms. The control arms feature EDP coating, heavy duty ball joints, offset washer inserts for easy caster adjustment, and factory style rubber bushings (optional Delrin bushings available separately). Control arms are available in upper & lower pairs, or a complete set of four control arms. Revised control arm design for better performance with an improved camber curve (must be used with with RK600-02 Spindles) – see Camber Curve Graph. See the Attached Alignment Recommendations for – for Daily Driver, Weekend Warrior, and Track Only vehicle applications. C3 Corvette Style Brakes Require 15″ Minimum Diameter Wheels. These upper & lower control arms are recommended for use with the following additional components of the Rekudo suspension system for the GM 2nd Generation F-Body (each part is sold separately): Spindles RK600-02 (pair) – spindles must be used 1968-1982 C3 Corvette style brakes. Front Springs RK200-11 (1″ lowered), or RK200-12 (2″ lowered) Front Shocks RK300-03 (2 required) Front Sway Bar RK500-02 Front Hubs RK600-01 (2 required) Front Brake Dust Shields RK400-17 (pair) Rear Leaf Springs RK200-02 (pair) Rear Shackles RK200-08 (set) Rear Shocks RK300-04 (2 required) Delrin Control Arm Bushing Set RK100-20 (set)