Most 1/18 brushless motor/esc setup should work. The rear wheels appear to be the pin type so many 1/18 wheel/tire combos that use a pin should work. The front you would just need the right size bearings. For these parts I would look at Tower, Amain, Horizon, Amazon, HobbyPartz, Hobbyking, and of course your local hobby shop. Just to name a few. These are the same places you would look for 1/10 accessories should you bail on the mini and go bigger.
I have a Losi mini with a castle creations mini sidewinder esc and a generic 28mm inrunner motor.
Did you check out the Losi page
for them? There a re a few parts listed as well as the exploded view.