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When ordering parts it is best to supply both the part number, description along with the make, model and year of your bike.

The information below will help you convert some of the older part numbers to the newer two digit, hyphen, four digit part numbers.

**BSA Part Numbers**

BSA changed to the newer system of two digits, a hyphen then four digits, (although there are a few exceptions where they have a slash followed by an additional one to three digits. To convert from the old to the new system insert zeros to fill in the missing digits.

Note – only the last two digits before the dash are the start of the part number, some early parts book preceded the part number with a price code which must be ignored.

2-123 becomes 02-0123

40-45 becomes 40-0045

67-678 becomes 67-0678

97-789/77 becomes 97-0789/77

**Norton Part Numbers**

Early Norton part numbers could be listed as 26076, R25830, NM16317, E9731, NMT1048 and several other variations. Most numbers today are six digits long, usually broken into a group of two and a group of four such as 06-0100. The front group “06” is the most often used but 00 through 04, along with 12, 14, and 99 are also common. The only way to update old numbers to new ones is by use of the “Supersession and Amended Part Number List.” This is available by ordering part number 00-5753.

**Triumph Part Numbers**

In 1973 Triumph converted from an alpha-numeric numbering system to a numerical one. With the exception of the numbers S1-30 through S70-7, which became 60-0000 numbers, and a few others, most part numbers are converted as shown below:

D1234 (4 digits) becomes 60-1234

H5678 (4 digits) becomes 97-5678

E2345 (4 digits) becomes 70-2345

S6789 (4 digits) becomes 21-6789

E13456 (5 digits) becomes 71-3456

T7890 (4 digits) becomes 57-7890

F4567 (4 digits) becomes 82-4567

W8901 (4 digits) becomes 37-8901

F14567 (5 digits) becomes 83-4567

H898 (3 digits) becomes 97-0898

**Summary**

A number of older parts have been discontinued but often a later version can be used in their place. These parts are a direct replacement and while functionally the same, something has been changed (new material, different heat treating, etc.) which has dictated that a new part number be assigned. Because of this, invoices may show part numbers different from the one you ordered.