Fits 1970-1981 GM F-Bodies;Fits 1975-1979 GM X-Bodies;Includes both lower (AAL321) and upper (AAU321) control arms;Manufactured from heavy-duty DOM steel tubing;Laser-cut, CNC-formed steel plate braces;Greaseable, internally fluted Delrin bushings;Includes new ball joints;Preassembled with new polyurethane bump stops;Eliminates A-arm deflection;Non-adjustable;Requires less shim stack for negative camber than OE arms;Two additional degrees of positive caster built into lower and upper A-arms, providing a total of four additional degrees of positive caster in the kit;Provides additional header clearance;Improves steering feel and response for normal and performance driving;Available in red or black hammertone powder coat for long lasting good looks;4-5 hour installation time;Proudly designed in the USA!;Proudly made in the USA!