They are in the 20mm Road Warrior & 28mm Road Warrior sections
The made a lot of FGU game based miniatures years ago and I think some of the sculpts were for the old Aftermath! RPG miniatures line at one point.
Also, they have a step by step guide in which they show taking Hot Wheels vehicles and turning them into war rigs inspired by the Road Warrior. (Most Hot Wheels, Matchbox, etc. toy cars are 20mm if you are wondering the scale.)