Rotor Arm Ignition Original AC Delco Rolls Royce & Bentley Nato 2920998066269 AC # 7952331 Rolls Royce Bentley # RD8550P 1945-1955 Silver Wraith, Mk-6, R-type, Sliver Dawn 1946-1959 All cars with a 6 cyl Engine Rolls Royce Bentley RD8550P