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).
Types of bushes fitted to various chassis ranges.
| Identifier | ExFiles\Box 78\2\ scan0086 | |
| Date | 11th March 1912 | |
| R.R. 148 (20 H) (X698 11.3.12) G 2439 X 654 "Fibre" bushes in front springs from 1550 to 1600 from 1600 chassis fibre bushes fitted all round. From 1838 - All colonial chassis fitted with P.B. bushes " 1886 All chassis have P.B. bushes fitted } (9 colonial) Approx 23 cars have had Phosphor Bronze bushes fitted by RD 2584 cars all bushes 50 " rear bushes JPR / 15/11/- | ||