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 comparing the frame heights for three different 40/50 chassis models.
| Identifier | ExFiles\Box 16\7\ Scan072 | |
| Date | 31th May 1928 guessed | |
| FRAME HEIGHTS 40/50 EAC7 22.825 TO GROUND FACIO SS{S. Smith}, 22.500 TO GROUND F2B PHANTOM 23.325 TO GROUND | ||