You are going to have to run the Redcat BS903-058 rear hub carriers. They are thicker then the Himotos on the rear so the bearing are farther apart and will take up the extra room.
http://urchobby.com/proddetail.php?prod=BS903-058 Even though the site pic shows the same ones you have they are thicker and will take up the gap that you have. How is the front?