Just was browsing the RCM custom motor mounts and stubled apon the losi muggy cutom motor mount and it looks like the exact same center diff design as my Matrix TR truggy. Heres the motor mount- http://www.rc-monster.com/proddetail...od=RCMmuggymnt Heres of a pic of the matrix's center setup...
I am sure that even if not a direct fit you could get one of them to work. I know on the Muggy mount you still have to do some cutting on the Muggy to make it work as well.