Get some 8mm connectors...
For the BEC...any particular reason you can't just plug it into the Rx? The BEC power leads are soldered to their respective (+) and (-) leads on the ESC. Normally you can strip back the insulation on the ESC power lead and wrap/solder the BEC wire around it. The BEC output can just plug into an empty slot in the Rx, or, if you don't have one and need to direct-wire the servos, remove the red/black wires from the servo leads and connect them in parallel to their respective outputs on the BEC. Then just plug the servo lead with the white wire into the Rx channel.