It's not hard to figure out the guaranteed manufacturer series world tour representatives and first and second backups, Outlaw has a whole spreadsheet with it. I also had one but gave up now the website has the global manu ranking. This recent link also shows the order of the regions within each manufacturer https://www.gran-turismo.com/au/gtsport/news/00_8009073.htmlJosese as back up.
Tsu tsu might end up as a back up too if he's not lucky.
Great system
Don't worry about Tsu Tsu he's represting the 3rd best region for Lexus. Akagi has no chance of going to NY as Mazda is not in the top 12. There are other hard luck cases of very fast racers not going to world tours for manufacturer series but... such is manufacturer series.