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This is one of the ways to add this new skin as a standalone:
- Create a duplicate of one of the already existing GT40 folders. (ex. 420)
- Paste inside your new skin (ex: GT987.dds) and delete the old one (gt420.dds)
- Wdit all the names of the files you'll find inside, changing any "420" for that "987" you're using for your new car. So, instead a GB420.veh you should have a GB987.veh, instead a GB420extra1.dds you should have a GB987extra1.dds and so on.
- Open the .veh file and be sure to change the line DefaultLivery="GB420.dds" to DefaultLivery="GB987.dds". This must be the file name of the skin you've created.
- Then change the number, team, driver, etc at your will. Keep in mind that if you don't change the team the new car will appear in the same team of the original 420.
There're other ways to do it and you can personalize your new car even more, but I think this might work as a start point for you.
In the case you need more detail about this process don't hesitate to take a look to this tutorial about how to add new standalone car to Historic GT & Touring Cars mod (Thanks to ODS-SdP for the link)