It's just a matter of taking a 1/8 buggy of your choice, and getting a 1/8 onroad body of your choice and sticking the two together.
Or u can do this:
http://www.ultimaterc.com/forums/showthread.php?t=97225
btw the dimensions on that rust read as a 1/8th. Width was not changed, length was extended a inch.
and then u have Jangs project 21
http://www.ultimaterc.com/projects/project-21/
(wich is undergoing a rally car phase)
http://www.ultimaterc.com/forums/showthread.php?t=96651
hope this gives you some more choices