Hotchkis 64-67 GM A-Body Double Adjustable Upper Trailing ArmsHotchkis Sport Suspension 1203AA 1964 1967 GM A Body DBL Adjustable Upper Trailing Arms. Improve the traction and handling of your GM 64 67 GM A Body Muscle Cars with the Hotchkis Double Adjustable Upper Trailing Arms. These exceptionally durable control arms allow for easy pinion angle adjustment for reduced vibration and increased traction. Our exclusive Swivel Max bushings offer non binding articulation during suspension travel which improves