Microworld games just release a set of post apocalypse vehicles that could be used for Car Wars in 1x scale. There slightly smaller than the orginal game scale, but I would guess that they'll look close enough. There are bikes, cars, a minibus and a semi truck. The semi trailer is much shorter than the Car Wars counter, but everything else seems like it's a close enough size.
http://www.microworldgames.com/colle...microwasteland