Well Done Procrustes in tracing these down,
Sure are "The Dirty Dozen"
What we now need to know is which are the main, reputable suppliers, who are just reselling, and who are assembling parts from other manufacturers and badge engineering. As someone else stated some of these companies are large million dollar enterprises in comparison to some of the parts suppliers and assemblers (and painters) are 2-bit backstreet hovels.
I was impressed with the Poweranand site, they took the trouble to put a service manual, a spare parts catalogue and a test report on the 8/1 850rpm (albeit from 1979) on their site. Interesting that this report is fairly comprehensive and contains dimension information of principal parts.
They even have a picture of Rocketboys twin sitting in the corner of its hangar, to reinforce that they are now selling to the US market.
It was interesting to see that some of the part numbers in the Anand parts catalogue were directly lifted from the original Lister parts catalogue. Does this mean, I wonder, whether, there is still a good compatability of parts for intechannging.
Time will tell, as I have several original Listers over here that will benefit a new lease of life from Indian parts.
Finally, I got no replies to my suggestion for a register of Listeroids in spreadsheet form. Surely someone must be interested in knowing what the popular engines are amongst forum members (and not just the EPA)!
Ken