This is the antenna crown nut / aerial crown nut.  This is the nut ONLY, it will not have the insert with this nut. Note: If you need the assembly look up part# UD25603 1980-1998 Spirit, Spur,...

This is the chrome top for the antenna (aerial) mast. We do offer the rubber insert (UD25605) for the crown. 1980-1998 Silver Spirit, Silver Spur, Mulsanne, Turbo R

The is rubber aerial crown seal. 1980-1987 Mulsanne, Spirit, Spur, Turbo (VIN 01001-16970) 

This is the distance piece between the seal (UD22735) & bracket (UD22740) of the aerial. 1980-1980 Mulsanne, Spirit, Spur 1009-1401

This is the aerial bracket spacer on the wing of the car. 1984-1987 Mulsanne, Spirit, Spur, Turbo (VIN 08193-16970)