Left.2017-20. Right.2017-20. Strut mount nut. 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. Part cannot be reused/reinstalled. Suspension Shock Absorber Mount Nut. Suspension Strut Mount Nut. Suspension Strut Nut. Flange. Air Spring. Lock. Shock Absorber. Top.