Hi,
Actually, I *very much* appreciate that TRF uses the original part numbers that can be found in the reprints of the orignal Factory Spares Catalog, as opposed to the number methods some other vendors use. This makes for better comparison of parts numbers from model to model (and there are many interchangeable parts) and is clearer when something has been superceded. The only exceptions with TRF are certain kits they have assembled, to which they apply their own part numbers.
In England, Rimmer Bros and others still use the original part numbers, too.
With other vendors who have created their own numbering systems, there is no telling if what you are sent is correct or not, until you receive it and can make direct comparison. I've had more than a few items that clearly weren't correct and the part number would have told me so before I even ordered it.
Now, if I were TRF, I'd simply plug the numbers other vendors are using into my website, too. That way their catalogs would also served as my catalogs! It would be a lot of work accurately putting those numbers in the computer, of course, but not any more than putting in all the original parts catalog numbers and it would only have to be done once (unless the other vendor changes their number system).
Reprints of the parts catalogs are widely available, and highly recommended and useful. Be sure to get the correct one for your car. For example, TR4 and TR4A parts catalogs are different, although the TR4 and 4A factory repair/service manual is all in one book.
One trick that sometimes helps is to go to Rimmer Bros (
https://www.rimmerbros.co.uk/) to look up the number, then use that number for a parts search at TRF. Rimmer doesn't yet have TR2/3/3A online, however, but does have TR4/4A/250/5/6/7/8.
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