Is there still a way to get them? I was on vacation when the event was active. :/
Damn it. Thanks anyways for the response!
I guess you can still get the Western Sovereign motorcycle whenever.
This is the car spawner I use:
https://www.mpgh.net/forum/showthread.php?t=993757
Then use this tutorial:
https://www.mpgh.net/forum/showthread.php?t=967293