2014-15. 27888. COUPE. Spoiler nut. W/O Z28. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Engine Coolant Expansion Tank. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Power Steering Pump Reservoir. Liftgate Lift Support Nut. Spoiler Nut. Window Regulator Nut. Tool. Engine Coolant. Liftgate Lift Support. Power Steering. Side shield. Support strut. Tank. Window Regulator. Included with: Spoiler.