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).
Specification table detailing various car interior dimensions.
| Identifier | ExFiles\Box 127\5\ scan0074 | |
| Date | 4th October 1940 guessed | |
| - 2 - Rear seat width Effective. 36" 36" 36" 36" 40" 46" 39" 42" Super DeLuxe Rear seat depth 15" 18 1/2" 17" 18" 18 1/2" 21" Maximum interior 49" 48" 48" 48" 50" 53" width. At rear At rear elbows elbows | ||