Yeah Mike sells the FLM stuff. I believe you need to replace the stub axles and maybe the rear arms/carriers (with FLM) for the FLM CVDs to work. I'm not sure since I don't have the FLM CVDs on my Rustler. I'm using the MIP kit which I like very much, just FYI...
FLM makes a drop in kit for the rustler, no upgrades needed. $48 part # FLM26315
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.