[BP-Revo]

Well, the rear shock of a Rusty is the same as a Maxx shock. So, if it fits a maxx it should fit the rear (but certain ones like Piggybacks and powerstrokes might not fit because they may be too large in diameter or the reservoir might get in the way).

Also, the Powerstrokes are going to hella stiff in your Rusty - those springs are stiff enough that only 1 is used per corner on a Maxx, so its about 2x stiffer than a Traxxas Red spring, and then some (since its stiffer than a stock maxx's suspension). I'd say its probably 3-4 times stiffer.

On a side note...Integy shocks tend to leak.