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 vehicle component modifications and their corresponding design reference numbers.
| Identifier | ExFiles\Box 3\4\ 04-page244 | |
| Date | 22th March 1933 guessed | |
| -3- Section. | Description. | Design. --- | --- | --- Dash Brackets & Floorboards. | Floorboards, Covers &c. Dash brackets. | LeC's 3401,3404, LeC.3403 Front & Rear Equalizers. Servo Mech: Rear Brake Inter.Shaft. | Revised lever lengths, to improve/clearance, ground | LeC.3408 Road Wheels. | Bentley monogram on wheel nuts. | LeC.3400 Petrol Tank. | 18 gallon petrol tank. | LeC.3411 Front Shock Dampers and Axle control. | New lever forging for damper also new forging for Axle Control anchorage. See also frame and fittings. | LeC.3398 Petrol Piping. | Arranged for S.U.Carburetters. with new Knots Filter, and larger Petrol Pump. | LeC.3414 Suction Hot Spot Return. | Connecting pipes, tee piece, and lead away to Silencer. Silencer and main piping to follow. | LeC.3414 Carburetter Air Silencer. | Castings to be ordered, and bosses added to rocker cover and inlet pipes. Sheet metal work to await Exp: Dept. test, as capacity may be modified. LeC 3395 | LeC.3395 Inlet Pipes. | Add three bosses on top of inlet pipes for mounting the Carburetter Air Silencer. | LeC.3395 Front Apron. | In conjunction with Radiator Stone Guard. | N.Sch.3706 | ||