Choose from thousands of Twisted Shifterz shift knobs for your C5 automatic shifter. CNC machined aluminum adapter allows easy installation for a factory look with lower shift knob installed height than others. Uses our M16 thread shift knobs. Select this adapter with all knobs - Not available with C5 fit knobs which are 9/16-18 for 6 speed. Select adapter when adding shift knob selection to cart. Not Sold Separately.