SHIFTWORKS 2008-2009 Mustang Bullitt 5-Speed White Shift Knob & Retainer Designed to use the 2008 - 2009 Bullitt shift boot, Ford part #8R3Z7277-CB. This boot has an opening of approximately 0.50 inches, whereas the standard GT boot opening is approximately 0.75 inches. Shift knobs are metric M12-125 thread Includes Correct Boot Retainer. One Piece Quality USA made.