Originally Posted by Matthew_Armeni

The D plate fits ST wheels with no option parts and all of the plates are different than the one-piece spindles so right away you have 2 options with the truck, D plate or one piece spindle. The C,B, and A plate push the mounting point into the wheel (further away from the center of the car) 1mm at a time. So by running +1, +2, or +3 hexes you can fit more of the plates. The C plate will actually work when using the stock hex but will cause the steering rod end to rub the wheel slightly.
I would definitely suggest that everyone try the new spindles and the 18° LRC carriers. To me, it was the biggest handling change we made on the truck. The spindles are also great on the buggy as well, gives the buggy so much more usable steering.