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).
Comparison table of vehicle parts and systems for different specifications, namely Peregrine and Bentley.
| Identifier | ExFiles\Box 179\1\ img194 | |
| Date | 28th December 1931 guessed | |
| SECTION. | COMMON TO BOTH PEREGRINE AND BENTLEY. | SPECIFICATION OF PEREGRINE.. | SPECIAL TO BENTLEY. INSTRUMENT BOARD. | All parts except speedometer. | Grouped system; bought out to our specification. | Special speedometer BATTERY. | ------ | Same as J.3. £6.) | Special battery. (Double Ford @ 50/-) WHEEL CARRIERS. | Dummy hub at rear. | Side or dummy hub at rear. | Nil. Rear wheel only. DYNAMO. | ------ | RR. - same as J.{Mr Johnson W.M.} 3. | Bought out (or RR ?) STARTER MOTOR. | All parts. | RR. design. | Nil. DISTRIBUTOR. | All parts. | RR. - same as J.{Mr Johnson W.M.} 3. | ? Delco. JUNCTION BOX ETC. | All parts. | As on J.{Mr Johnson W.M.} 3. | ------ WHEELS. | All parts. | 17" rims, 4" section, tyres 5.50". | R.{Sir Henry Royce} W. knock on nuts. BRAKE MECHANISM. | Most parts. | J.{Mr Johnson W.M.} 3. equalisers, but no servo; automatic adjustment at pedal. | Special re-arrangement of parts to suit frame. UNDERSHIELD. | Nil. | Following J.{Mr Johnson W.M.} 3. | Special. LUBRICATION. | All parts. | Conjunction of grouped oilers. | ------ EXHAUST. | Nil. | J.{Mr Johnson W.M.} 3. modified. | Special. STEERING. | Steering box and connections generally. | ------ | Spring steering wheel. | ||