This is the headlamp bulb, clear glass, double filament, 12v  48/50w. These are offered in Halogen only at this time.  1946-1955 Mk-6, R-type, Silver Dawn, Silver Wraith 1956-1959 Silver...

This is a Headlamp Dimmer Floor Switch if you wish to also purchase the dimmer switch cover that item is

This is an new original chrome head lamp moulding motif.  Note: 2 Per Car (Sold Each) If your car is before VIN# B169NY look up part # RD4534

This is the chrome plated headlamp rim.  The front measurement measures 7-1/4"   Note:  Attached Photo does not capture how beautiful the chrome is on this...