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).
Blueprint diagram of a Plymouth engine front and rear mounting system.
| Identifier | Morton\M9\ img072 | |
| Date | 21th October 1931 guessed | |
| PLYMOUTH ENGINE FRONT MOUNTING THIS PORTION IS FIXED TO THE CHASSIS C CENTRE OF GRAVITY B CENTER OF GRAVITY STABILIZING SPRING PLYMOUTH ENGINE REAR MOUNTING | ||