Triumph part numbering
Pre 1972 Triumph used a letter prefix and from 1972 onwards they used a number prefix.
The later system has the number prefix followed by four numbers.
e.g. E327 becomes 70-0327 and T23 becomes 57-0023 etc.
Where there are only one, two or three numbers after a letter, add in one , two or three zero,s until the part number contains four characters
S = 21 – e.g. S550 becomes 21-0550
W = 37 – e.g. W135 becomes 37-0135
T = 57 – e.g. T23 becomes 57-0023
D = 60 – e.g. D1860 becomes 60-1860
D1= 61 – e.g. D13694 becomes 61-3694
E = 70 – e.g. E1591 becomes 70-1591
E1 = 71 – e.g. E10007 becomes 71-0007
F = 82 – e.g. F3655 becomes 82-3655
F1 = 83 – e.g. F12239 becomes 83-2239
H = 97 – e.g. H4001 becomes 97-4001
14- Remains unchanged
