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).
Diagram comparing the frame heights for three different 40/50 HP chassis models.
| Identifier | ExFiles\Box 14\8\ Scan064 | |
| Date | 31th May 1928 guessed | |
| FRAME HEIGHTS 40/50 EAC7 22.825 TO GROUND EAC10 SS{S. Smith} 22.500 TO GROUND F2B PHANTOM 23.325 TO GROUND | ||