Where can I find this wall?

I saw this wall in many people's videos. I couldn't find it as a 3D model anywhere. They're probably getting it from a map.

 

It is used in the Piccolina stunt driving mission. Comes with the West Coast map.

 

how can I find?

 

Sorry for the long delay, I couldn't boot up the game until this week.
It is called autobello_sized_panel