Rolls-Royce 20/25: D2 series GYD24 on

Part Code	Sub-section
AA	Chassis frame, mountings, brackets etc
AD	Bulkhead and fittings
BA	Front springs and shackles
BB	Front damper A-links
BC	Rear springs and shackles
BD	Rear damper links
BE	Shock dampers
CA	Axle beam and stub axles
CB	Front hub and brakedrum
CC	Front brakes
DA	Differential assembly
DB	Rear hub and brakedrum
DC	Rear brakes
EA	Brake servo
EB	Brake equaliser shafts
FA	Steering box and column
FB	Side tube
FC	Cross tube
GA	Cylinder head
GB	Cylinder block and pistons
GC	Crankshaft assembly and conrods
GD	Flywheel and clutch
GE	Crankcase and main bearings and fittings
GF	Vibration damper
GG	Timing gears and auxiliary drives
GH	Camshaft and followers
GJ	Sump, filter, oil pump and pipes
GK	Fan
HA	Gearbox
HE	Propshaft and damper
JA	Petrol tank
JB	Pipes and filters
JC	Fuel pumps
JD	Carburettors, air silencer and inlet manifold
KA	Radiator
KB	Water pump and Y-pipe
KC	Radiator mountings
KD	Thermostat
KE	Radiator shell and shutters
LB	Ignition system
LC	Dynamo
LD	Starter and Bendix drive
LF	Charging and distribution
MA	Exhaust system
NA	Pedals and linkage