Go to your game files, then open "content", then "vehicles", then "vivace", then "vehicles" and then "vivace" again, and you should be in the vivaces files. Then just look out for a "vivace.dae" and copy this onto your desktop. Then you have the vivace's 3d model.
Where the Vivace's files are located is: C:\Program Files (x86)\Steam\steamapps\common\BeamNG.drive\content\vehicles\vivace.zip then vehicles/vivace .
Open blender, click on the top left button (file if I recall correctly), then go down to import and in the new menu that shows up click on the button with "dae". Then simply select the .dae file you copied out of the zip and press "Open".