PART NO.  SPL.PAGE  DESCRIPTION                                                             
1A1546    15.A.3    Oil thrower -crankshaft (front) -(engine unit, 1500)
1A1546    sup.4     Thrower -oil -crankshaft -(engine unit, sup)
1A1546    16.A.4    Thrower -oil -crankshaft -(pulley, engine unit, 1600)
1A1546    TC.A.3    Oil thrower -crankshaft -(pulley, engine unit, T.C.)
1A1546    16.A.25   Thrower -oil -crankshaft front -(engine unit, 1622)
                    -changed to 12H775  -Com (e) 16GC/8263 (1622 engine)
12H775    16.A.25   Thrower -oil -crankshaft front  -Com (e) 16GC/8263 (1622 engine) 
                    -was 1A1546 Fin (e) 16GC/8262
AEH427    TC.A.7    Thrower -oil -(crankshaft, engine, Twin Cam)

The AEH427 oOil Thrower for the MGA Twin Cam engine is substantially larger and different shape from the parts for the pushrod engines.