Comment from Freidjof:
"the bodies are the regular Revell bodies. The interieur is from revell, completed with a lexan part, to reduce the weight.
Chassis is the Sakatsu Stock - car chassis. The wheels came also from the Sakastu chassis.
The tire decals are from Fred Cady (???).
To improve your german, I will send a link: http://www.nascar124.de/