Here is an alternative, https://github.com/Tinase-nau/FH4-car-IDs
An open source Forza Horizon 4 Car ID list. Found in CSV, JSON, and XML format.
If you want to just see it on the web and don't need the files, use my airtable @ https://bit.ly/33LSfpu
Konman @ Forza Mods blocked their Car ID list from being editable, so I parsed connections from Airtable and pulled JSON, cleaned out all the unnecessary items, then fixed up the obfuscated names.
Let me know by making a Github Issue and I will work hard to add it! You may also follow https://github.com/embedvr/FH4-Car-ID-List/issues/1#issuecomment-1306840568 for some IDs as well.