1964 Oldsmobile Vista Cruiser was one of the first modern Family station wagons made by Oldsmobile and there parent company GM this car is most famous in That 70's Show and belonged to Eric Foreman and was the main staged in the show until last episode. 
This Model was converted from the one used it GTA 4 link here:
https://www.gtaall.com/gta-4/cars/164851-oldsmobile-vista-cruiser-us.html
To Install the Mod 
Open OpenIV and go to 
C:\Program Files\Rockstar Games\Grand Theft Auto V\mods\update\update.rpf\common\data
Then copy this line in te dlclst.xml
<Item>dlcpacks:/vista/</Item> to the dlclist.xml
save and exit 
use either Enhanced Native Trainer or Add On Car Spawner
1964 Oldsmobile Vista Cruiser\vista
or with the Trainer just: vista