I am currently trying to decide which body mount to upgrade to.
Traxxas aluminum Body Mount
RPM Body mount
Kingheadz alum Body mount
Fast Lane Machine alum Body mount kit
Feel free to recommend others. These are the just ones that I've seen recommended elsewhere.
The one that I am leaning towards right now is the Fast Lane Machine kit that still retains slipper set up. It allows for a larger bearing, it is a one piece design that looks like it would be air tight, heavy guage alum, comes with all the parts needed in one kit.