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).
Numbered list of specifications for various vehicle components and systems to be fitted.
| Identifier | ExFiles\Box 168\3\ img054 | |
| Date | 31th December 1938 | |
| -2- Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/MW.31.12.38. (10) Induction system to be up to date in accordance with LOP.EB.4233. (11) Metalastik dynamo coupling to be fitted. (12) "General" oil filter to be fitted which Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} will supply. (13) Rolls-Royce distributor to be fitted. Governor characteristics to suit Bentley. (14) Front compartment of sumps to be fitted with "trap door" as standard Wraith. (15) Flywheel Rim RM.{William Robotham - Chief Engineer}5420, Diaphragm GB.4417, Friction plate to GB.4416 and 10" Long clutch. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||