Some run 1/10 bodies but you can still use the standard CRT.5 body. The still use the standard CRT.5 body on the new Extended Version of the CRT.5 but the front mount is switched on the other side of the shock tower (or something on the line of that)
I've get a good fit from the Losi RTR XXX-T body. It is a lot narrower than most 1/10 truck bodies. It fits great by just cutting off the back wing section of the body.