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).
Comparative table of component specifications for experimental and production chassis.
| Identifier | ExFiles\Box 161a\3\ scan0043 | |
| Date | 27th January 1939 | |
| - 10 - BY/NS.{Norman Scott}1/G.27.1.39. Sec.No. | Title. | IOP. No. | 1st. 50 Exp. Production Chassis. | 250 Production Chassis. | Wraith Type Gearbox. ---|---|---|---|---|--- 5240 | Controls. | | Design required for Mixture Control and Damper Gov, Control. | | Revised Damper Control 5250 | Radiator. | | Appearance approved, as fitted on 9.B.5. Mods. to Rm{William Robotham - Chief Engineer}/Std.5/MH.{M. Huckerby}19.1.39. | As 50 SETS | 5260 | Bonnet | | As fitted to 9.B.5. | | No change. 5270 | Starting Handle. | EB.4135 15.12.38. | To LOP. | To LOP. | No change. 5290 | Undershields. | | Designed, but not yet detailed due to doubt as to gearbox. | | New design required. 7190 | Instrument Board. | | As 9.B.5. but with 8.B.5. type lighting. | | No change. 7360 | Wiring & Fittings. Lucas Foot Switch. | | No electrical connection to carburetter. Stop light moved to change gear gate. Lucas foot switch. | As 50 sets. | 8050 | Horn Switch. | DW.517 28.12.38. | As Wraith to LOP. | As to LOP. | No change. | ||