Important information for pre 1973 machines:

In 1973 Triumph introduced a numerical part numbering system which
superseded the old alpha-numeric system. For these earlier models the
following information will help to find the new number in our system.
Prefix letters have been converted to numeric prefixes, as shown in the
table opposite. We use a plain dash - to seperate part number fields.
If you are having no result with the search engine, try using just the last
four numbers (max) or just the numbers after an alphabetic character.