http://www.rc-monster.com/proddetail...YOIF147&cat=40
it really is not ment for the ex-1 cd because it uses a 5mm output cup instead of a 6mm like the kyosho. so what i did was cut off the plastic bearing support on the kyosho gear and cut off the ex-1's one and used that its really not that good. im looking for a new diff . possibly the rcm slipper.