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).
Table comparing requirements and modifications for different vehicle production builds.
| Identifier | ExFiles\Box 97\2\ scan0026 | |
| Date | 2nd March 1939 | |
| -2- Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux}11/MH.{M. Huckerby}2.3.39. | ITEMS FOR B.V. PRODUCTION NOT YET RUN 15,000 MILES. | 3.B.50. | 14.B.V. | |---|---|---| | FCD.1113 Rover type bonnet with latest catches. | Required. | Paulin special. | | FCD.1228 Lightened rear shock damper brackets and rebound stops to suit semi-floating rear axle and bump buffer. | Required. Rebound stops not called for on B.50 with fixed jacks but should be fitted for test. | Special damper scheme not common to B.V. | | GCD.1060 Rear engine mounting. | Required. | Required. | | Yokes giving 1½° castor. | Not common to B.V. but have also got 1½° castor. | 1" out of centre point yokes with zero castor required. | | Modifications to oil catcher in rear hubs. | Required on completion of experimental work. | | | GCD.892 Latest semi-floating rear axle and .650" hypoid gears. | Required. | Required, but gears will be mock up for higher ratio. | | Latest joints and rubbers for rear brake equaliser. | Fitted. | Fitted. | | GCD.1061 Propellor shaft with larger joints. | Required. | Required. | | Correct transmission line to suit .650" hypoid. | Required. | Required. | | Finalised gear box and servo. | Required. | Required. | | ||