Do you mean this one?
http://www.hobbyking.com/hobbyking/s...up_System.html
If so i bought one thinking the same thing, but the 1/12 scale hub bearings inserts are to small to take the GT12 stubs
Was gonna try pushing out the brg's reaming out the hole to take some GT12 front hub brg's.
Cheers'
Shiny.