From RROCA-info

These links give basic Rolls-Royce model specifications, the Chassis Number series used for that model and the number of cars of that model produced.

Early Cars (1904 - 1906)	Silver Ghost (1907 - 1925)
New Phantom (1925 - 1929)	Phantom II (1929 - 1935)
Phantom III (1936 - 1939)	Phantom IV (1950 - 1956)
Phantom V (1960 - 1968)	Twenty HP (1922 - 1929)
20/25 HP (1929 - 1937)	25/30 HP (1936 - 1938)
Wraith (1938/39)	Silver Wraith (1946 - 1958)
Silver Dawn (1949 - 1955)	Silver Cloud (1955 -1959)
Silver Cloud II (1959 - 1962)	Silver Cloud III (1962 - 1965)
Silver Shadow (1965 - 1980)	Silver Spirit (1980 - )

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The Bentley models made by Rolls-Royce after acquiring Bentley Motors were assigned different Chassis Numbers from their Rolls-Royce counterparts. The model technical specifications also differed slightly.

Bentley 3 ½ litre (1933 - 1936)	Bentley 4 ¼ litre (1936 - 1939)
Bentley Mark V (1939)	Bentley Mark VI (1946 - 1952)
Bentley R-Type (1952 - 1955)	Bentley S1 (1955 - 1959)
Bentley S2 (1959 -1962)	Bentley S3 (1962 - 1965)
Bentley Continental (1951 - 1966)