This is the only Kei car in the BeamNG Mod Repository, the Ibishu Chisai! I made this in 660cc Base, Turbo Sport and IRD trim levels. It has an engine, full interior and non-opening boot! The IRD also has a roll cage replica too. I attached all the trim levels as the last 2 images, as this is a mod car so you might not be familiar with trim levels.
Wheel
Colour
Interior
Wheels
All cars have these wheel options and all of them come with the tyres Rendered. Other bigger vehicles have only one option, which are the ones rendered on the vehicle. Some wheels in certain rare colours may cost more to get, watch out for that, though I marked all wheel colours that were expensive as so. Car colours (interiors and bodies) can also be expensive, if you choose a rare colour such as pink. I mostly try to keep car costs down, but sometimes that is impossible!