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 listing parts not yet fitted to production chassis for the 20 HP model.
| Identifier | ExFiles\Box 29\2\ Scan172 | |
| Date | 3rd January 1928 | |
| -2- BY/MMn8/K.{Mr Kilner} 3. 1. 28. PARTS NOT YET FITTED TO PRODUCTION CHASSIS. Date Issued. | Stn.Sht. No. | TITLE. | DATE COMPLETED. | SERIES WHERE BROUGHT IN. | CHASSIS TO TEST. 20 HP. CHASSIS 23.5.27. | X.235/5520 | Hydraulic Damper on Rear | 20.6.27. | 101 in L. | 15.1.28. 21.3.27. | X.4565 | 33 x 6 Tyres for 20 HP. with W.B. Rims. | 22.6.27. | Not known. | 23.5.27. | X.5250 | Radiator with Integral Vertical Shutters. | 1.9.27. | M Series. | 1.4.28. 23.5.27. | X.5240 | New Controls on Instru Board. | 5.10.27. | M Series. | 1.4.28. 23.5.27. | X.5080/5430 | Mixture control on Column. | 7.10.27. | ..do.. | ..do.. 9.9.27. | X.8720 | Ballast Resistance of 39" of 33 SWG. Nickel Wire. | 23.9.27. | When existing material has been used. | 20.10.27. | X.5430/8430 | Deletion of Oil Holes and Grooves in Steering Worms. | 15.11.27. | When existing material has been used up. | 7.11.27. | X.5600 | Spare Wheel Fixing Bolt with Handle instead of Hexagon. | 12.12.27. | M Series. | 19.3.28. 10.11.27. | X.5800/5260 | Wider Dash & Bonnet. | 22.12.27. | N Series. | 1.10.28. 14.11.27. | X.8692 | Battery Ingition Contact breaker. | 22.12.27. | M Series. | 19.3.28. 22.11.27. | X.5650/3587 | Starter Drive. | 12.12.27. | M Series. | 19.3.28. | ||