This 2.25" Corvette Script 6 Speed Shift Knob fits on the OEM shifter and retains the OEM mount and boot lip. As many know the OEM shifter has a unique mount (no threads a slot on top and a screw to secure it). Universal knobs just don't work here. Built using a custom billet insert and a 6 speed ball you get a knob that fits the same as OEM, but is what many have been asking for. ·2.25" Diameter.·A nice added benefit is the height of the ball is lower by 1.5".·Made of black or white acrylic with 6 Speed Pattern and Corvette script.·Works on stock 2005+ C6, Z06, ZR1 and Grand Sport manual shifters.·Installs in minutes with a Phillips screwdriver (2008+) or a T20 torx (2005-2007).