The EC5 plugs that are the good ones are available on SMC's site. They are a plug not the bird cage style.
I used to use them, but they are very difficult to separate. I was worried that I was going to pull a post off my RX8 I had to pull so hard, then they released suddenly. Switched to Traxxas and am happy with them even though they are from the often reviled "T" company.