The upper arms are generally the adjustable arms so that you can dial in your pinion angle which is affected by raising or lowering the car. The industry refers to lengthening or shortening of the upper control arm as adjustment which it technically is.
Changing the mounting point (raising and lowering the arm) would affect the instant center. It could eliminate or reduce wheel hop in many cases. It also affects how the car reacts to engine torque to transfer weight better. But there are no parts because no one considers a car this big to be a sports car.