They are the small version of anderson power poles (a larger version is used and provided for the battery).
Here's one source:
http://www.powerwerx.com/anderson-po...owerpole-sets/
The pre-welded saves some time.
You can color code or even key them to avoid mistaken hookups. We used green-white on the motor side of our jaguars and victors so as not to blow them up accidentally.