Ability to purchase custom vans

After the welcomed addition of the new Weazel News fleet last week, I can't help but want to be able to purchase that big mercedes sprinter van they have access too. I'd like to have some vans similar to this imported and available to buy from dealerships. 

https://www.gta5-mods.com/vehicles/mercedes-sprinter-211-cdi-addon-replace-template
https://www.gta5-mods.com/vehicles/mercedes-benz-sprinter-2011-unlocked
https://www.gta5-mods.com/vehicles/maibatsu-mule-4x4-addon