Didn't know they had a batch of stuff for the rustler. $88 isn't too bad considering what your getting, if they stock them again:
http://www.fastlanemachine.net/proddetail.php?prod=FLM26720
Very clean setup. Can't imagine those slider axles on the rear will hold up too long. When I converted my eJato, I was running 2S with the traxxas 3500kv motor. The axles lasted 30 seconds. Then the plastic single speed conversion lasted 2 minutes.
Now that I have traxxas cvd's and a steel...