A Control Arm is a suspension link that locates a wheel hub or spindle in space, allowing vertical motion while constraining fore-aft and lateral movement. Most independent suspensions use upper and lower control arms (sometimes called A-arms or wishbones based on shape) at each front wheel. Control arm length, mounting point geometry, and bushing or rod end choice are fundamental determinants of suspension behavior. Griggs Racing manufactures tubular control arms with spherical bearings for Mustang strut and SLA applications.