Left.2WD. Right.2WD. Strut mount nut. W/O ADAPTIVE RIDE CONTROL. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Active Suspension Air Spring. Mounting Nut for Suspension Shock Absorber. Suspension Shock Absorber Mount Nut. Suspension Strut Mount Nut. Absorber. Air Spring. Strut. Top.