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 experimental parts fitted to chassis 6.EX.
| Identifier | ExFiles\Box 43\1\ Scan018 | |
| Date | 22th June 1920 | |
| x 3986 Extract from RHC{R. H. Coverley - Production Engineer}1/LG22.6.20* RE CHASSIS 6.EX. Will you kindly note that the above car has been fitted with the following experimental parts:- X.3657. - Clutch Ring. - N.2032. X.3726. - 1" higher Radiator - N.2558. X.3554. - Short Clutch Lever - N.1983. X.3986. - Starter clutch having 32 teeth. X.3082. - Starter Slipping Clutch - N. sch. 323. X.3545. Rear Axle. approx. ratio. 3.47:1. | ||