Losi Makes a 43t Plastic spur for the 8e. I guarantee that'll fit between the braces and on the smartdiff. The Kyosho always leaked on my 8ight diff...
Maxx - FLM, MMM, CD Med.36x706s
Raja - FLM Ext. MM, 1512, 4s
SC8ight - MMM, 1520, 6s
D8T - MMM 1717 6s