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 modifications to frames, fittings, and petrol tanks with corresponding design numbers.
| Identifier | ExFiles\Box 3\4\ 04-page245 | |
| Date | 23th March 1933 guessed | |
| -4- Section. | Description. | Design. --- | --- | --- Frames & Fittings. | Modified Side forgings for engine support crossmember. These are now handed. | Lec.3398 Petrol Tank. | Larger capacity using 40/50 HP. chassis details. | Lec.3417 | ||