The low profile servo not fitting is simply an observation, and no it's 'not' going to fit into that gap, you would have to mall something major to do so...

Only reason I bring it up is more people 'are' using duel low profile servos on nitro cars now, I was thinking of doing it myself (I like low profile servos), my observation is simply that I'm not going to be able to do that on a MTX5, no big deal, I'm sure I'll get over it.


30Tooth - Spurs look simular, but I'd not bet money on it, they are advertising the internal ratios are different, so we could be looking at different teeth numbers than the 3 or 4 series.
As for the rims, I don't recognize them, but there has been several new 'black' rims coming out of several companies recently, black is the new cool for RC.