This is the plastic coupling that sits behind the ignition barrel in the switchbox. It is recommended that you keep a spare on hand at all times.  1990 from VIN 30001 onward

This is the ignition coil for all non-Turbo cars from VIN 6751 to 17000 and for all Turbo cars from VIN 4233 to 16570 1981-1998 Silver Spirit, Sliver Spur, Mulsanne, Turbo R, Pre Arnage,...

This is the ignition module base plate and pick-up.  This is an original part (OEM) 1987-1989 VIN 20000-28000

This is the ignition rotor for single point distributors. 1969-1980 Silver Shadow, Shadow II, T-1, T-2, Silver Wraith, Corniche (8742-41686) 1980-1990 Silver Spirit, Silver Spur, Mulsanne, Eight...