from 10/13/2012. Knuckle mount bolt. Left.FWD. Right.FWD. A fastener used to secure a Control Arm. A threaded rod with a drive head (such as hex, 12 point, torx, etc) on one end used to secure the Differential Housing Mount to it's Mounting point. Lateral Arm Bolt. Part cannot be reused/reinstalled. Suspension Knuckle Bolt.