The Car Tunerz are
slightly larger than ZipZaps, maybe by about 1/4" in length. The wheel wells are over-sized, so I'm betting that you could get a Tunerz body to sit on a ZZ chassis with a little work. I'm going to try it when I get a chance -- I picked one up on my lunch break today. I just don't have the tools handy to disassemble the Tunerz here at work.
Oh, they're metal, so don't expect to have a speedy machine if you use one of those bodies
