Currectrac® adjustable length upper control arms for use on all 1964-1967 GM A-body cars. Units feature adjustability without having to have either end removed from the vehicle via a "turnbuckle" style design featuring RH/LH threads in the center and double jam nuts. The center of the arm is hex shaped aluminum and is polished and blue anodized. Housing end of the arm features a "fork" for mounting the arm to the housing, and the housing end of the arm features Currie's Johnny Joint® urethane bushed rod end that allows for 30 degrees of overall travel. This joint is fully greasable and rebuildable.