what have to be similar most, i think, is the pitch of the gear, the size of the ball cup, the diameter of the gear, the size of the bearing ( inside and outside) and the width of the whole diff ball cup include.

so that a lot !! that why i think if one fit it can only be a team losi one, since a evader is like 50% same part as the old XX-nt.

but i know someone who got a stpampeed witch is basically a rustler, i'll check that out.
tanks.