From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
List of alterations to a standard model and the corresponding anticipated weight savings.
| Identifier | ExFiles\Box 132\2\ scan0146 | |
| Date | 10th July 1941 guessed | |
| -4- Alteration to Standard. | Anticipated Weight Saving. | Comments. -----------------------|--------------------------|---------- Forward: | 353 | Mechanical Petrol Pump. Elimination of Petrol filter. | 5 | Spare Wheel carried under boot. Eliminates :- 1. Spare wheel carrier. 2. Spare wheel cover. Necessitates second floor to boot. | 10 lbs. | Lighter Wing Stays. Lamps fitted as on Riplett. No brackets. | 4 " | Lighter rear road springs. | ? | Myth type instruments with Lucas switch. | 2 | Body as 12.B.V. but with 20 lbs. lighter luggage grid dural bucket seats, aero leather and glass. | 210 | | 584 | | ||