Hotchkis Sport Suspension 11390U 1963 - 1972 C - 10 Tubular Upper Control Arms. Install the Hotchkis Tubular Upper A - Arms on your 63 - 72 C - 10 Pickup and gain vastly increased handling and control. These TIG - welded geometry corrected bolt - on arms offer premium quality construction and improve camber gain dramatically increasing handling performance. Added caster improves high speed stability while the smooth operating Delrin bushings in the 4130 billet cross shaft allow the arms to move through their travel easily. Finished in gloss black powder coat the arms are ready to install and are complete with premium ball joints and integrated droop stops. Easy installation with no vehicle modifications required. For even greater handling improvements combine with the Hotchkis Sport Suspension Tubular Lower A - Arms. Features Improved negative camber gain dramatically improves handling performance. Increased Caster for high speed stability. Smooth operating greasable Delrin Bushings Light weight Strong 1 - 18 in. TIG - welded tubing. TIG - welded laser cut Reinforcement Gussets. 4130 offset Cross Shaft for improved negative camber gain. Includes high quality Ball Joints. Benefits Improves handling stability and steering response. Improved camber gain dramatically improves handling performance. Increased caster for high speed stability. Increased structural rigidity over stock due to TIG welding and laser cut support plates. Delrin bushings allow smooth operation with minimal deflection throughout travel range. Integrated droop stop for proper suspension travel. PROUDLY MADE IN THE USA.