From RROCA-info

Number produced: 5,201
Original Specification: 6 cylinders, overhead inlet and side exhaust valves, 88.9 mm. x 114.3 mm. (4257 c.c.), single plate clutch, 4-speed, brakes hydraulic front and mechanical rear with servo, suspension independent front and semi-elliptic rear, wheelbase 120", weight (complete car) about 4000 lbs., tyres 6.50 x 16.

Chassis Series	Year	Comments
B 2-254 AK	1946/47	4 ¼ litre
B 1-247 AJ	1947
B 2-400 BH	1947
B 1-401 BG	1947/48
B 2-500 CF	1947/48
B 1-501 CD	1948/49
B 2-500 DA	1948/49
B 1-501 DZ	1948/49
B 2-500 EY	1949
B 1-501 EW	1949
B 2-500 FV	1949/50
B 1-601 FU	1949/50
B 1-401 GT	1950
B 2-250 HR	1950
B 1-251 HP	1950
B 2-250 JO	1950/51
B 1-251 JN	1950/51
B 2-200 KM	1950/51
B 1-201 KL	1951
B 2-400 LJ	1951
B 1-401 LH	1951
B 2-400 MD	1951	92.1 mm. x 114.3 mm. (4566 c.c.)
B 1-403 MB	1951
B 2-500 NZ	1951/52
B 1-501 NY	1952
B 2-300 PV	1952
B 1-301 PU	1952