uga:
you have to use the ball cup from the original shock for the rear. the front of the hotbodies shock fits the ball on the antenna mount but develops play after a while. if you can get an hpi ball stud that is long enough to retain the height and you can space it up then that will work too but the hpi ball studs break real easy
the shock accepts the same springs. just make sure your antenna mount is in the forward holes because this shock is longer this way you can still adjust droop and also because of the piston in the shock you should up your weight by 10
i run a copper spring with 55w oil